hv: fix "Else alternative missing in if."

All if . . else if constructs shall be
terminated with an else statement.

Tracked-On: #861
Signed-off-by: Huihuang Shi <huihuang.shi@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com

hypervisor/dm/vpci/vmsix.c

@@ -326,6 +326,8 @@ static int32_t vmsix_table_mmio_access_handler(struct io_request *io_req, void *
 				}
 			}
 			clac();
+		} else {
+			/* No other state currently, do nothing */
 		}
 	}