[PATCH] IB/mthca: Fix memory leak on error path

Free page_list buffer on error path of mthca_reg_phys_mr().

Signed-off-by: Roland Dreier <roland@topspin.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>