Fix gcc missing case warnings

Gcc ASSERT() missing cases are impossible

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>

module/zfs/arc.c

@@ -1143,6 +1143,8 @@ arc_space_consume(uint64_t space, arc_space_type_t type)
 	ASSERT(type >= 0 && type < ARC_SPACE_NUMTYPES);
 
 	switch (type) {
+	default:
+		break;
 	case ARC_SPACE_DATA:
 		ARCSTAT_INCR(arcstat_data_size, space);
 		break;
@@ -1167,6 +1169,8 @@ arc_space_return(uint64_t space, arc_space_type_t type)
 	ASSERT(type >= 0 && type < ARC_SPACE_NUMTYPES);
 
 	switch (type) {
+	default:
+		break;
 	case ARC_SPACE_DATA:
 		ARCSTAT_INCR(arcstat_data_size, -space);
 		break;

module/zfs/dmu_send.c

@@ -1012,6 +1012,8 @@ backup_byteswap(dmu_replay_record_t *drr)
 		DO64(drr_end.drr_checksum.zc_word[3]);
 		DO64(drr_end.drr_toguid);
 		break;
+	default:
+		break;
 	}
 #undef DO64
 #undef DO32

module/zfs/dsl_prop.c

@@ -413,6 +413,8 @@ dsl_prop_check_prediction(dsl_dir_t *dd, dsl_prop_setarg_t *psa)
 		case ZFS_PROP_QUOTA:
 		case ZFS_PROP_RESERVATION:
 			return;
+		default:
+			break;
 		}
 	}
 

module/zfs/sa.c

@@ -398,6 +398,8 @@ sa_attr_op(sa_handle_t *hdl, sa_bulk_attr_t *bulk, int count,
 			if (error)
 				return (error);
 			break;
+		default:
+			break;
 		}
 	}
 	return (error);

module/zfs/spa.c

@@ -471,6 +471,9 @@ spa_prop_validate(spa_t *spa, nvlist_t *props)
 			    intval != 0 && intval < ZIO_DEDUPDITTO_MIN)
 				error = EINVAL;
 			break;
+
+		default:
+			break;
 		}
 
 		if (error)
@@ -1425,6 +1428,8 @@ static int
 spa_check_logs(spa_t *spa)
 {
 	switch (spa->spa_log_state) {
+	default:
+		break;
 	case SPA_LOG_MISSING:
 		/* need to recheck in case slog has been restored */
 	case SPA_LOG_UNKNOWN:

module/zfs/vdev_label.c

@@ -565,6 +565,8 @@ vdev_inuse(vdev_t *vd, uint64_t crtxg, vdev_labeltype_t reason,
 
 		case VDEV_LABEL_SPARE:
 			return (spa_has_spare(spa, device_guid));
+		default:
+			break;
 		}
 	}
 

module/zfs/zfs_ioctl.c

@@ -483,6 +483,8 @@ zfs_secpolicy_setprop(const char *dsname, zfs_prop_t prop, nvpair_t *propval,
 	 * Check permissions for special properties.
 	 */
 	switch (prop) {
+	default:
+		break;
 	case ZFS_PROP_ZONED:
 		/*
 		 * Disallow setting of 'zoned' from within a local zone.
@@ -3380,6 +3382,8 @@ zfs_check_settable(const char *dsname, nvpair_t *pair, cred_t *cr)
 				return (ENOTSUP);
 		}
 		break;
+	default:
+		break;
 	}
 
 	return (zfs_secpolicy_setprop(dsname, prop, pair, CRED()));