msc_mgcp.c: Fix several wrong ptr printf fmt

Fixes several of these type of warnings:
include/osmocom/core/fsm.h:123:38: warning: format ‘%x’ expects argument of type ‘unsigned int’, but argument 9 has type ‘char *’ [-Wformat=]
   LOGP((fi)->fsm->log_subsys, level, "%s{%s}: " fmt, \
                                      ^
src/libmsc/msc_mgcp.c:277:71: note: format string is defined here
    "CRCX/RAN: creating connection for the RAN side on MGW endpoint:0x%x...\n", mgcp_ctx->rtp_endpoint);
                                                                      ~^

Change-Id: I17b7bed8fc39612286ba66f250b6b26da01d38c0
1 file changed