Fix compile time error in drivers/scsi/lpfc/lpfc_scsi.c

When compiling with hardened gcc-4.5.3 on x86, warnings of unused variable
‘rc’ are treated as errors causing failure.  This patch supresses the warnings
and fixes the compile time failure.

X-Gentoo-Bug: 425816
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=425816
Author: gokturk@binghamton.edu
Reported-by: Dennis Schridde <devurandom@gmx.net>
Signed-off-by: Anthony G. Basile <basile@opensource.dyc.edu>

--- a/drivers/scsi/lpfc/Makefile	2012-07-20 17:12:36.767906363 -0400
+++ b/drivers/scsi/lpfc/Makefile	2012-07-20 17:13:06.217791507 -0400
@@ -22,7 +22,7 @@
 ccflags-$(GCOV) := -fprofile-arcs -ftest-coverage
 ccflags-$(GCOV) += -O0
 
-ccflags-y += -Werror
+ccflags-y += -Wno-unused -Werror
 
 obj-$(CONFIG_SCSI_LPFC) := lpfc.o