[PATCH] ipc/mqueue: use unsigned int for retval

[Nicholas Mc Guire]

The retval variable is assigned by bitops only and thus there is no
reason to use a signed type. Further matching it with the return 
type of the function also makes static code checkers happy.

Signed-off-by: Nicholas Mc Guire <der.herr@xxxxxxx>
---

Found by experimental type-checking coccinelle script

Patch was compile tested with: x86_64_defconfig

Patch is against 4.10-rc6 (localversion-next is next-20170209)

 ipc/mqueue.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 4fdd970..897ce70 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -519,7 +519,7 @@ static int mqueue_flush_file(struct file *filp, fl_owner_t id)
 static unsigned int mqueue_poll_file(struct file *filp, struct poll_table_struct *poll_tab)
 {
 	struct mqueue_inode_info *info = MQUEUE_I(file_inode(filp));
-	int retval = 0;
+	unsigned int retval = 0;
 
 	poll_wait(filp, &info->wait_q, poll_tab);
 
-- 
2.1.4