IB/hfi1: Fix the size parameter to find_first_bit

The 2nd parameter of 'find_first_bit' is the number of bits to search.
In this case, we are passing 'sizeof(u64)' which is 8.

It is likely that the number of bits of 'port_mask' was expected here.
Use sizeof() * 8 to get the correct number.

It has been spotted by the following coccinelle script:
@@
expression ret, x;

@@
*  ret = \(find_first_bit \| find_first_zero_bit\) (x, sizeof(...));
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/hfi1/mad.c

@@ -2638,7 +2638,7 @@ static int pma_get_opa_datacounters(struct opa_pma_mad *pmp,
 	 */
 	port_mask = be64_to_cpu(req->port_select_mask[3]);
 	port_num = find_first_bit((unsigned long *)&port_mask,
-				  sizeof(port_mask));
+				  sizeof(port_mask) * 8);
 
 	if (port_num != port) {
 		pmp->mad_hdr.status |= IB_SMP_INVALID_FIELD;
@@ -2842,7 +2842,7 @@ static int pma_get_opa_porterrors(struct opa_pma_mad *pmp,
 	 */
 	port_mask = be64_to_cpu(req->port_select_mask[3]);
 	port_num = find_first_bit((unsigned long *)&port_mask,
-				  sizeof(port_mask));
+				  sizeof(port_mask) * 8);
 
 	if (port_num != port) {
 		pmp->mad_hdr.status |= IB_SMP_INVALID_FIELD;
@@ -3015,7 +3015,7 @@ static int pma_get_opa_errorinfo(struct opa_pma_mad *pmp,
 	 */
 	port_mask = be64_to_cpu(req->port_select_mask[3]);
 	port_num = find_first_bit((unsigned long *)&port_mask,
-				  sizeof(port_mask));
+				  sizeof(port_mask) * 8);
 
 	if (port_num != port) {
 		pmp->mad_hdr.status |= IB_SMP_INVALID_FIELD;
@@ -3252,7 +3252,7 @@ static int pma_set_opa_errorinfo(struct opa_pma_mad *pmp,
 	 */
 	port_mask = be64_to_cpu(req->port_select_mask[3]);
 	port_num = find_first_bit((unsigned long *)&port_mask,
-				  sizeof(port_mask));
+				  sizeof(port_mask) * 8);
 
 	if (port_num != port) {
 		pmp->mad_hdr.status |= IB_SMP_INVALID_FIELD;