block/cciss.c: remove pointless curr_queue calculation

curr_queue is a local variable in a for loop, and it's being initialized
at the start of each loop.  So any assignment at the end of the loop is
pointless.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Cc: Mike Miller <mike.miller@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>