[PATCH] common/rc: fix mount options quoting in _mount

From: An Long <[email protected]>

In commit 078f320 ("treewide: convert all $MOUNT_PROG to _mount"),
direct calls to $MOUNT_PROG were converted to call the helper function
_mount.
However, the _mount helper was implemented using `$*` instead of `"$@"`.
This unquoted argument expansion triggers word splitting on any arguments
containing spaces (such as the overlay mount options containing spaces in
tests `overlay/083` and `overlay/086`), causing the mount to fail with
"mount: bad usage".
Fix this regression by using `"$@"` in the _mount helper, which correctly
preserves argument boundaries exactly as they were provided by the caller.
---
 common/rc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/common/rc b/common/rc
index 79189e7e..56dbea6f 100644
--- a/common/rc
+++ b/common/rc
@@ -296,10 +296,10 @@ _has_dmesg_since_option()
 
 _mount()
 {
-	$MOUNT_PROG $*
+	$MOUNT_PROG "$@"
 	ret=$?
 	if [ "$ret" -ne 0 ]; then
-		echo "\"$MOUNT_PROG $*\" failed at $(date)" >> "$seqres.mountfail?"
+		echo "\"$MOUNT_PROG $@\" failed at $(date)" >> "$seqres.mountfail?"
 		if _has_dmesg_since_option; then
 			dmesg --since '30s ago' >> "$seqres.mountfail?"
 		else
-- 
2.51.0