rpc: fix leak reported by asan

==5943==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 17276 byte(s) in 18 object(s) allocated from:
    #0 0x7fe4b07cfe60 in strdup (/lib64/libasan.so.5+0x3be60)
    gluster#1 0x497f5a in gbStrdup /root/gluster-block/utils/utils.c:461
    gluster#2 0x413858 in glusterBlockCallRPC_1 /root/gluster-block/rpc/block_svc_routines.c:615
    gluster#3 0x4180d6 in glusterBlockCreateRemote /root/gluster-block/rpc/block_svc_routines.c:960
    gluster#4 0x7fe4b076858d in start_thread (/lib64/libpthread.so.0+0x858d)

Direct leak of 396 byte(s) in 18 object(s) allocated from:
    #0 0x7fe4b0883c08 in __interceptor_malloc (/lib64/libasan.so.5+0xefc08)
    gluster#1 0x7fe4b04478c7 in _IO_vasprintf (/lib64/libc.so.6+0x7a8c7)

Direct leak of 32 byte(s) in 2 object(s) allocated from:
    #0 0x7fe4b0883c08 in __interceptor_malloc (/lib64/libasan.so.5+0xefc08)
    gluster#1 0x7fe4b05a6bb9 in __rpc_uaddr2taddr_af (/lib64/libtirpc.so.3+0x13bb9)

SUMMARY: AddressSanitizer: 17704 byte(s) leaked in 38 allocation(s).

Signed-off-by: Prasanna Kumar Kalever <[email protected]>
Reviewed-by: Xiubo Li <[email protected]>
Reviewed-by: Amar Tumballi <[email protected]>

rpc/block_svc_routines.c

@@ -1050,6 +1050,9 @@ glusterBlockCreateRemoteAsync(blockServerDefPtr list,
   }
 
  out:
+  for (i = 0; i < mpath; i++) {
+    GB_FREE(args[i].reply);
+  }
   GB_FREE(args);
   GB_FREE(tid);