apps/nshlib: Fix error handling in 'cat' command. On a failure to allocate memory, a file was not being closed. From Bruno Herrera.

ChangeLog.txt

@@ -1417,4 +1417,6 @@
 	  initialized the network (2015-08-26).
 	* apps/nettest: Extend test so that can be performed using the local
 	  loopback device (2015-08-26).
-
+	* apps/nshlib: Fix error handling in 'cat' command.  On a failure to
+	  allocate memory, a file ws not being closed.  From Bruno Herrera
+	  (2015-08-26).

nshlib/nsh_fscmds.c

@@ -439,6 +439,7 @@ static int cat_common(FAR struct nsh_vtbl_s *vtbl, FAR const char *cmd,
   buffer = (FAR char *)malloc(IOBUFFERSIZE);
   if(buffer == NULL)
     {
+      (void)close(fd);
       nsh_output(vtbl, g_fmtcmdfailed, cmd, "malloc", NSH_ERRNO);
       return ERROR;
     }