Fix some compile warnings

The compile warnings:

src/thrift/c_glib/transport/thrift_ssl_socket.c:790:35: warning: pointer targets in passing argument 1 of ‘thrift_ssl_socket_get_error’ differ in signedness [-Wpointer-sign]
thrift_ssl_socket_get_error("No cipher overlay", THRIFT_SSL_SOCKET_ERROR_CIPHER_NOT_AVAILABLE, error);
^~~~~~~~~~~~~~~~~~~
src/thrift/c_glib/transport/thrift_ssl_socket.c:206:6: note: expected ‘const guchar *’

{aka ‘const unsigned char *’} but argument is of type ‘char *’
void thrift_ssl_socket_get_error(const guchar *error_msg, guint thrift_error_no, GError **error)


src/thrift/c_glib/transport/thrift_ssl_socket.c:309:48: warning: pointer targets in passing argument 2 of ‘thrift_ssl_socket_get_ssl_error’ differ in signedness [-Wpointer-sign]
thrift_ssl_socket_get_ssl_error(ssl_socket, "Receive error",
^~~~~~~~~~~~~~~
src/thrift/c_glib/transport/thrift_ssl_socket.c:158:6: note: expected ‘const guchar *’ {aka ‘const unsigned char *’}

but argument is of type ‘char *’
void thrift_ssl_socket_get_ssl_error(ThriftSSLSocket *socket, const guchar *error_msg, guint thrift_error_no, int ssl_error, GError **error)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/thrift/c_glib/transport/thrift_ssl_socket.c: In function ‘thrift_ssl_socket_write’:
src/thrift/c_glib/transport/thrift_ssl_socket.c:345:48: warning: pointer targets in passing argument 2 of ‘thrift_ssl_socket_get_ssl_error’ differ in signedness [-Wpointer-sign]
thrift_ssl_socket_get_ssl_error(ssl_socket, "Send error",
^~~~~~~~~~~~
src/thrift/c_glib/transport/thrift_ssl_socket.c:158:6: note: expected ‘const guchar *’

{aka ‘const unsigned char *’} but argument is of type ‘char *’
void thrift_ssl_socket_get_ssl_error(ThriftSSLSocket *socket, const guchar *error_msg, guint thrift_error_no, int ssl_error, GError **error)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/thrift/c_glib/transport/thrift_ssl_socket.c: In function ‘thrift_ssl_socket_handle_handshake’:
src/thrift/c_glib/transport/thrift_ssl_socket.c:410:48: warning: pointer targets in passing argument 2 of ‘thrift_ssl_socket_get_ssl_error’ differ in signedness [-Wpointer-sign]
thrift_ssl_socket_get_ssl_error(ssl_socket, "Error while connect/bind", THRIFT_SSL_SOCKET_ERROR_CONNECT_BIND, rc, error);
^~~~~~~~~~~~~~~~~~~~~~~~~~
src/thrift/c_glib/transport/thrift_ssl_socket.c:158:6: note: expected ‘const guchar *’ {aka ‘const unsigned char *’}

but argument is of type ‘char *’
void thrift_ssl_socket_get_ssl_error(ThriftSSLSocket *socket, const guchar *error_msg, guint thrift_error_no, int ssl_error, GError **error)

src/thrift/c_glib/transport/thrift_socket.c: In function ‘thrift_socket_open’:
src/thrift/c_glib/transport/thrift_socket.c:154:29: warning: passing argument 1 of ‘thrift_socket_close’ from incompatible pointer type [-Wincompatible-pointer-types]
thrift_socket_close(tsocket, NULL);
^~~~~~~
src/thrift/c_glib/transport/thrift_socket.c:103:39: note: expected ‘ThriftTransport *’

{aka ‘struct _ThriftTransport *’}

but argument is of type ‘ThriftSocket *’

{aka ‘struct _ThriftSocket *’}

thrift_socket_close (ThriftTransport *transport, GError **error)

src/thrift/c_glib/protocol/thrift_multiplexed_protocol.c:60:9: warning: implicit declaration of function ‘thrift_protocol_decorator_write_message_begin’; did you mean ‘thrift_protocol_write_message_begin’? [-Wimplicit-function-declaration]
ret = thrift_protocol_decorator_write_message_begin(protocol, service_name, message_type, seqid, error);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
thrift_protocol_write_message_begin
src/thrift/c_glib/protocol/thrift_multiplexed_protocol.c: In function ‘thrift_multiplexed_protocol_class_init’:
src/thrift/c_glib/protocol/thrift_multiplexed_protocol.c:142:28: warning: assignment to ‘gint32 (ThriftProtocol *, const gchar *, const ThriftMessageType, const gint32, GError **)’

{aka ‘int (*)(struct _ThriftProtocol *, const char *, const enum <anonymous>, const int, struct _GError **)’}

from incompatible pointer type ‘gint32 (ThriftMultiplexedProtocol *, const gchar *, const ThriftMessageType, const gint32, GError **)’

{aka ‘int (*)(struct _ThriftMultiplexedProtocol *, const char *, const enum <anonymous>, const int, struct _GError **)’}

[-Wincompatible-pointer-types]
cls->write_message_begin = thrift_multiplexed_protocol_write_message_begin;