scsi: aic94xx: Fix fall-through warnings for Clang

In preparation to enable -Wimplicit-fallthrough for Clang, fix multiple
warnings by explicitly adding a couple of break and fallthrough statements
instead of just letting the code fall through to the next case.

Link: https://github.com/KSPP/linux/issues/115
Link: https://lore.kernel.org/r/9b58459045d303bbea0160f2e349f5799402a2bf.1605896059.git.gustavoars@kernel.orgSigned-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/aic94xx/aic94xx_scb.c

@@ -721,6 +721,7 @@ static void set_speed_mask(u8 *speed_mask, struct asd_phy_desc *pd)
 		fallthrough;
 	case SAS_LINK_RATE_3_0_GBPS:
 		*speed_mask |= SAS_SPEED_15_DIS;
+		fallthrough;
 	default:
 	case SAS_LINK_RATE_1_5_GBPS:
 		/* nothing to do */
@@ -739,6 +740,7 @@ static void set_speed_mask(u8 *speed_mask, struct asd_phy_desc *pd)
 	switch (pd->min_sata_lrate) {
 	case SAS_LINK_RATE_3_0_GBPS:
 		*speed_mask |= SATA_SPEED_15_DIS;
+		fallthrough;
 	default:
 	case SAS_LINK_RATE_1_5_GBPS:
 		/* nothing to do */

drivers/scsi/aic94xx/aic94xx_task.c

@@ -315,6 +315,7 @@ static void asd_task_tasklet_complete(struct asd_ascb *ascb,
 		break;
 	case SAS_PROTOCOL_SSP:
 		asd_unbuild_ssp_ascb(ascb);
+		break;
 	default:
 		break;
 	}
@@ -609,6 +610,7 @@ int asd_execute_task(struct sas_task *task, gfp_t gfp_flags)
 				break;
 			case SAS_PROTOCOL_SSP:
 				asd_unbuild_ssp_ascb(a);
+				break;
 			default:
 				break;
 			}