Replace a comma between expression statements by a semicolon.

Fixes: 178b48d5 ("xfs: remove the for_each_xbitmap_ helpers")
Signed-off-by: Chen Ni <nichen@iscas.ac.cn>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>