IB/srp: Print "ib_srp: " prefix once

pr_debug() already prints prefix PFX. Avoid that PFX is printed
twice if the debug statement in srp_add_target() is enabled.

Fixes: 34aa654ecb8e ("IB/srp: Avoid that I/O hangs due to a cable pull during LUN scanning")
Signed-off-by: Bart Van Assche <[e-mail]>
Reviewed-by: Leon Romanovsky <[e-mail]>
Tested-by: Laurence Oberman <[e-mail]>
Cc: Christoph Hellwig <[e-mail]>
Cc: Sagi Grimberg <[e-mail]>
Signed-off-by: Doug Ledford <[e-mail]>

drivers/infiniband/ulp/srp/ib_srp.c

···
 		goto out;
 	}
 
-	pr_debug(PFX "%s: SCSI scan succeeded - detected %d LUNs\n",
+	pr_debug("%s: SCSI scan succeeded - detected %d LUNs\n",
 		 dev_name(&target->scsi_host->shost_gendev),
 		 srp_sdev_count(target->scsi_host));