Fix [-Wimplicit-fallthrough] warnings in PDO SQLite extension

Author: Girgias

ext/pdo_sqlite/sqlite_statement.c

@@ -103,6 +103,7 @@ static int pdo_sqlite_stmt_execute(pdo_stmt_t *stmt)
 
 		case SQLITE_ERROR:
 			sqlite3_reset(S->stmt);
+			fallthrough;
 		case SQLITE_MISUSE:
 		case SQLITE_BUSY:
 		default:
@@ -265,6 +266,7 @@ static int pdo_sqlite_stmt_fetch(pdo_stmt_t *stmt,
 
 		case SQLITE_ERROR:
 			sqlite3_reset(S->stmt);
+			fallthrough;
 		default:
 			pdo_sqlite_error_stmt(stmt);
 			return 0;
@@ -359,6 +361,8 @@ static int pdo_sqlite_stmt_col_meta(pdo_stmt_t *stmt, zend_long colno, zval *ret
 
 		case SQLITE_BLOB:
 			add_next_index_string(&flags, "blob");
+			/* TODO Check this is correct */
+			fallthrough;
 		case SQLITE_TEXT:
 			add_assoc_string(return_value, "native_type", "string");
 			break;