scsi: aic7xxx: fix comment

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Hannes Reinecke <hare@suse.de>
Cc: linux-scsi@vger.kernel.org
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/scsi/aic7xxx/aic79xx_core.c

@@ -1298,7 +1298,7 @@ rescan_fifos:
 
 	/*
 	 * Wait for any inprogress DMA to complete and clear DMA state
-	 * if this if for an SCB in the qinfifo.
+	 * if this is for an SCB in the qinfifo.
 	 */
 	while (((ccscbctl = ahd_inb(ahd, CCSCBCTL)) & (CCARREN|CCSCBEN)) != 0) {