raid5-cache: inline r5l_alloc_io_unit into r5l_new_meta
raid5-cache: inline r5l_alloc_io_unit into r5l_new_meta

This is the only user, and keeping all code initializing the io_unit
structure together improves readbility.

Signed-off-by: Christoph Hellwig <923f7720577207a44b32e59bbfbea59d27f1ae8e@lst.de>
Reviewed-by: Shaohua Li <c0c0c8857ed6ec93282de3ee9d47e224acf995af@fb.com>
Signed-off-by: NeilBrown <1c00aa603bb92d594c03cff60ecf8e63b2a5bcb1@suse.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs