[PATCH] ovl: fix bugon.cocci warnings

[kernel test robot <lkp@intel.com>]

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CC: kbuild-all(a)lists.01.org
CC: linux-kernel(a)vger.kernel.org
TO: Miklos Szeredi <mszeredi@redhat.com>
CC: linux-unionfs(a)vger.kernel.org
CC: linux-kernel(a)vger.kernel.org

From: kernel test robot <lkp@intel.com>

fs/overlayfs/util.c:466:2-5: WARNING: Use BUG_ON instead of if condition followed by BUG.
Please make sure the condition has no side effects (see conditional BUG_ON definition in include/asm-generic/bug.h)

 Use BUG_ON instead of a if condition followed by BUG.

Semantic patch information:
 This makes an effort to find cases where BUG() follows an if
 condition on an expression and replaces the if condition and BUG()
 with a BUG_ON having the conditional expression of the if statement
 as argument.

Generated by: scripts/coccinelle/misc/bugon.cocci

Fixes: 56230d956739 ("ovl: verify permissions in ovl_path_open()")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: kernel test robot <lkp@intel.com>
---

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   0477e92881850d44910a7e94fc2c46f96faa131f
commit: 56230d956739b9cb1cbde439d76227d77979a04d ovl: verify permissions in ovl_path_open()
:::::: branch date: 22 hours ago
:::::: commit date: 6 months ago

Please take the patch only if it's a positive warning. Thanks!

 util.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/fs/overlayfs/util.c
+++ b/fs/overlayfs/util.c
@@ -462,8 +462,7 @@ struct file *ovl_path_open(struct path *
 	struct inode *inode = d_inode(path->dentry);
 	int err, acc_mode;
 
-	if (flags & ~(O_ACCMODE | O_LARGEFILE))
-		BUG();
+	BUG_ON(flags & ~(O_ACCMODE | O_LARGEFILE));
 
 	switch (flags & O_ACCMODE) {
 	case O_RDONLY: