[SCSI] scsi_lib.c: properly count the number of pages in scsi_req_map_sg()
The calculation of nr_pages in scsi_req_map_sg() doesn't account for the fact that the first page could have an offset that pushes the end of the buffer onto a new page. Signed-off-by: NBryan Holty <lgeek@frontiernet.net> Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>
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