IB/srp: Fix a 32-bit compiler warning

The result of a pointer subtraction has type ptrdiff_t. Hence change a %ld format specifier into %td. This change avoids that the following warning is printed on 32-bit systems:

warning: format '%ld' expects argument of type 'long int', but argument 5 has type 'int' [-Wformat=]

---
 drivers/infiniband/ulp/srp/ib_srp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index 89e4560..577eb01 100644
@@ -1747,7 +1747,7 @@ static void srp_process_rsp(struct srp_rdma_ch *ch, struct srp_rsp *rsp)
 		}
 		if (!scmnd) {
 			shost_printk(KERN_ERR, target->scsi_host,
-				     "Null scmnd for RSP w/tag %#016llx received on ch %ld / QP %#x\n",
+				     "Null scmnd for RSP w/tag %#016llx received on ch %td / QP %#x\n",
 				     rsp->tag, ch - target->ch, ch->qp->qp_num);
 
 			spin_lock_irqsave(&ch->lock, flags);

2.1.2

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Thanks. Given that this is a new warning in the patches I merged I'll add this one as well.