[PATCH] mesh scsi: fix error handling

The PowerMac mesh SCSI driver had some missing error handling which would
trigger warnings due to lack of handling of return value from
scsi_add_host.  This fixes it.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: James Bottomley <James.Bottomley@SteelEye.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>