trivial: fix singal -> signal typo

Typo fix.

Signed-off-by: Frederik Schwarzer <schwarzerf@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 381838e..d86ebea 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -1650,7 +1650,7 @@
 	 * We use TASK_INTERRUPTIBLE so that the thread is not
 	 * counted against the load average as a running process.
 	 * We never actually get interrupted because kthread_run
-	 * disables singal delivery for the created thread.
+	 * disables signal delivery for the created thread.
 	 */
 	set_current_state(TASK_INTERRUPTIBLE);
 	while (!kthread_should_stop()) {