Fix f_int leak in error path

a memory leak was detected by valgrind:
==267184== 2,376 bytes in 1 blocks are definitely lost in loss record 2 of 2
==267184==    at 0x4C33B25: calloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==267184==    by 0x4E43342: allocate_fabric_internal (ibnetdisc.c:760)
==267184==    by 0x4E4353D: ibnd_discover_fabric (ibnetdisc.c:789)
==267184==    by 0x10A542: main (ibnetdiscover.c:1133)

Signed-off-by: Li Zhijian <[email protected]>

libibnetdisc/ibnetdisc.c

@@ -800,7 +800,7 @@ ibnd_fabric_t *ibnd_discover_fabric(char * ca_name, int ca_port,
  ibmad_port = mad_rpc_open_port(ca_name, ca_port, mc, nc);
  if (!ibmad_port) {
  IBND_ERROR("can't open MAD port (%s:%d)\n", ca_name, ca_port);
- return (NULL);
+ goto error_int;
  }
  mad_rpc_set_timeout(ibmad_port, cfg->timeout_ms);
  mad_rpc_set_retries(ibmad_port, cfg->retries);
@@ -810,13 +810,12 @@ ibnd_fabric_t *ibnd_discover_fabric(char * ca_name, int ca_port,
  NULL, NULL, ibmad_port) < 0) {
  IBND_ERROR("Failed to resolve self\n");
  mad_rpc_close_port(ibmad_port);
- return NULL;
+ goto error_int;
  }
  mad_rpc_close_port(ibmad_port);
 
  if (smp_engine_init(&engine, ca_name, ca_port, &scan, &config)) {
- free(f_int);
- return (NULL);
+ goto error_int;
  }
 
  IBND_DEBUG("from %s\n", portid2str(from));
@@ -836,6 +835,8 @@ ibnd_fabric_t *ibnd_discover_fabric(char * ca_name, int ca_port,
 error:
  smp_engine_destroy(&engine);
  ibnd_destroy_fabric(&f_int->fabric);
+error_int:
+ free(f_int);
  return NULL;
 }