scsi: aic7xxx: Remove unnecessary NULL checks before kfree

There are a number of places in the aic7xxx driver where a NULL check is
performed before a kfree(). However, kfree() already performs NULL checks
so this is unnecessary. Remove the checks.

Issue identified with Coccinelle.

Link: https://lore.kernel.org/r/20200403164712.49579-1-alex.dewar@gmx.co.uk
Signed-off-by: Alex Dewar <alex.dewar@gmx.co.uk>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/aic7xxx/aic79xx_core.c

@@ -3662,7 +3662,6 @@ ahd_free_tstate(struct ahd_softc *ahd, u_int scsi_id, char channel, int force)
 		return;
 
 	tstate = ahd->enabled_targets[scsi_id];
-	if (tstate != NULL)
 	kfree(tstate);
 	ahd->enabled_targets[scsi_id] = NULL;
 }
@@ -6119,7 +6118,6 @@ ahd_set_unit(struct ahd_softc *ahd, int unit)
 void
 ahd_set_name(struct ahd_softc *ahd, char *name)
 {
-	if (ahd->name != NULL)
 	kfree(ahd->name);
 	ahd->name = name;
 }
@@ -6181,11 +6179,8 @@ ahd_free(struct ahd_softc *ahd)
 		kfree(ahd->black_hole);
 	}
 #endif
-	if (ahd->name != NULL)
 	kfree(ahd->name);
-	if (ahd->seep_config != NULL)
 	kfree(ahd->seep_config);
-	if (ahd->saved_stack != NULL)
 	kfree(ahd->saved_stack);
 	kfree(ahd);
 	return;

drivers/scsi/aic7xxx/aic7xxx_core.c

@@ -2178,7 +2178,6 @@ ahc_free_tstate(struct ahc_softc *ahc, u_int scsi_id, char channel, int force)
 	if (channel == 'B')
 		scsi_id += 8;
 	tstate = ahc->enabled_targets[scsi_id];
-	if (tstate != NULL)
 	kfree(tstate);
 	ahc->enabled_targets[scsi_id] = NULL;
 }
@@ -4453,7 +4452,6 @@ ahc_set_unit(struct ahc_softc *ahc, int unit)
 void
 ahc_set_name(struct ahc_softc *ahc, char *name)
 {
-	if (ahc->name != NULL)
 	kfree(ahc->name);
 	ahc->name = name;
 }
@@ -4515,9 +4513,7 @@ ahc_free(struct ahc_softc *ahc)
 		kfree(ahc->black_hole);
 	}
 #endif
-	if (ahc->name != NULL)
 	kfree(ahc->name);
-	if (ahc->seep_config != NULL)
 	kfree(ahc->seep_config);
 	kfree(ahc);
 	return;
@@ -4927,7 +4923,6 @@ ahc_fini_scbdata(struct ahc_softc *ahc)
 	case 0:
 		break;
 	}
-	if (scb_data->scbarray != NULL)
 	kfree(scb_data->scbarray);
 }