scsi: lpfc: Fix overflow build issue

Build failed while enabling "CONFIG_GCOV_KERNEL=y" and
"CONFIG_GCOV_PROFILE_ALL=y" with following error:

BUILDSTDERR: drivers/scsi/lpfc/lpfc_bsg.c: In function 'lpfc_get_cgnbuf_info':
BUILDSTDERR: ./include/linux/fortify-string.h:114:33: error: '__builtin_memcpy' accessing 18446744073709551615 bytes at offsets 0 and 0 overlaps 9223372036854775807 bytes at offset -9223372036854775808 [-Werror=restrict]
BUILDSTDERR:   114 | #define __underlying_memcpy     __builtin_memcpy
BUILDSTDERR:       |                                 ^
BUILDSTDERR: ./include/linux/fortify-string.h:637:9: note: in expansion of macro '__underlying_memcpy'
BUILDSTDERR:   637 |         __underlying_##op(p, q, __fortify_size);                        \
BUILDSTDERR:       |         ^~~~~~~~~~~~~
BUILDSTDERR: ./include/linux/fortify-string.h:682:26: note: in expansion of macro '__fortify_memcpy_chk'
BUILDSTDERR:   682 | #define memcpy(p, q, s)  __fortify_memcpy_chk(p, q, s,                  \
BUILDSTDERR:       |                          ^~~~~~~~~~~~~~~~~~~~
BUILDSTDERR: drivers/scsi/lpfc/lpfc_bsg.c:5468:9: note: in expansion of macro 'memcpy'
BUILDSTDERR:  5468 |         memcpy(cgn_buff, cp, cinfosz);
BUILDSTDERR:       |         ^~~~~~

This happens from the commit 06bb7fc ("kbuild: turn on -Wrestrict by
default"). Address this issue by using size_t type.

Signed-off-by: Sherry Yang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Justin Tee <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Author: SherryYang1

drivers/scsi/lpfc/lpfc_bsg.c

@@ -5410,7 +5410,7 @@ lpfc_get_cgnbuf_info(struct bsg_job *job)
 	struct get_cgnbuf_info_req *cgnbuf_req;
 	struct lpfc_cgn_info *cp;
 	uint8_t *cgn_buff;
-	int size, cinfosz;
+	size_t size, cinfosz;
 	int  rc = 0;
 
 	if (job->request_len < sizeof(struct fc_bsg_request) +