ocfs2: drop a VLA in ocfs2_orphan_del()

ocfs2: drop a VLA in ocfs2_orphan_del()

Avoid a VLA by using a real constant expression instead of a variable.
The compiler should be able to optimize the original code and avoid
using an actual VLA.  Anyway this change is useful because it will avoid
a false positive with -Wvla, it might also help the compiler generating
better code.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Salvatore Mesoraca <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Reviewed-by: Andrew Morton <[email protected]>
Cc: Mark Fasheh <[email protected]>
Cc: Joel Becker <[email protected]>
Cc: Junxiao Bi <[email protected]>
Cc: Joseph Qi <[email protected]>
Cc: Changwei Ge <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>