locks: kill redundant local variable

There's no need for another variable local to this loop; we can use the
variable (of the same name!) already declared at the top of the function,
and not used till later (at which point it's initialized, so this is safe).
Signed-off-by: NJ. Bruce Fields <bfields@citi.umich.edu>

fs/locks.c

@@ -819,7 +819,7 @@ static int __posix_lock_file(struct inode *inode, struct file_lock *request, str
 	lock_kernel();
 	if (request->fl_type != F_UNLCK) {
 		for_each_lock(inode, before) {
-			struct file_lock *fl = *before;
+			fl = *before;
 			if (!IS_POSIX(fl))
 				continue;
 			if (!posix_locks_conflict(request, fl))