cosmetic: log: fix "CallIDs does not match"

Change-Id: I16f3bf1312f913b7a7f0d9ff5c42efa645c6a5b3
diff --git a/src/libosmo-mgcp/mgcp_msg.c b/src/libosmo-mgcp/mgcp_msg.c
index a89c579..a5bef7b 100644
--- a/src/libosmo-mgcp/mgcp_msg.c
+++ b/src/libosmo-mgcp/mgcp_msg.c
@@ -414,7 +414,7 @@
 
 	if (strcmp(endp->callid, callid) != 0) {
 		LOGP(DLMGCP, LOGL_ERROR,
-		     "endpoint:0x%x CallIDs does not match '%s' != '%s'\n",
+		     "endpoint:0x%x CallIDs mismatch: '%s' != '%s'\n",
 		     ENDPOINT_NUMBER(endp), endp->callid, callid);
 		return -1;
 	}