uml: helper.c warning corrections

Fix this warning:

  arch/um/os-Linux/helper.c: In function `helper_child':
  arch/um/os-Linux/helper.c:38:7: warning: ignoring return value of `write', declared with attribute warn_unused_result

[richard@nod.at: happens only with -D_FORTIFY_SOURCE=2]
Signed-off-by: Vitaliy Ivanov <vitalivanov@gmail.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/um/os-Linux/helper.c b/arch/um/os-Linux/helper.c
index b6b1096152aa..feff22d64672 100644
--- a/arch/um/os-Linux/helper.c
+++ b/arch/um/os-Linux/helper.c
@@ -28,14 +28,14 @@ static int helper_child(void *arg)
 {
         struct helper_data *data = arg;
         char **argv = data->argv;
-        int err;
+        int err, ret;
 
         if (data->pre_exec != NULL)
                 (*data->pre_exec)(data->pre_data);
         err = execvp_noalloc(data->buf, argv[0], argv);
 
         /* If the exec succeeds, we don't get here */
-        write(data->fd, &err, sizeof(err));
+        CATCH_EINTR(ret = write(data->fd, &err, sizeof(err)));
 
         return 0;
 }