9pfs: fix fd leak in local_opendir()

Coverity issue CID1371731

Signed-off-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

hw/9pfs/9p-local.c

@@ -435,6 +435,7 @@ static int local_opendir(FsContext *ctx,
 
     stream = fdopendir(dirfd);
     if (!stream) {
+        close(dirfd);
         return -1;
     }
     fs->dir.stream = stream;