ocfs2: use the bitmap API to simplify code

Use bitmap_zero() instead of hand-writing it.  It is less verbose.

While at it, add an explicit #include <linux/bitmap.h>.

Link: https://lkml.kernel.org/r/86d2a027c319db12055c98f00c65f7d01e703722.1658436259.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Christophe JAILLET <[email protected]>
Reviewed-by: Joseph Qi <[email protected]>
Cc: Mark Fasheh <[email protected]>
Cc: Joel Becker <[email protected]>
Cc: Junxiao Bi <[email protected]>
Cc: Changwei Ge <[email protected]>
Cc: Gang He <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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