Fix memory leak in _gss_acquire_mech_cred

lib/gssapi/mech/gss_acquire_cred_ext.c

@@ -100,6 +100,9 @@ _gss_acquire_mech_cred(OM_uint32 *minor_status,
 	mc= NULL;
     }
 
+    if (major_status != GSS_S_COMPLETE)
+        free(mc);
+    else
         *output_cred_handle = mc;
     return major_status;
 }