Remove non-sensical checks from firebird (php#16114)

These conditions are always true because they are arrays that are
address-taken, i.e. their addresses will never be NULL.

Author: ndossche

ext/pdo_firebird/firebird_driver.c

@@ -535,7 +535,7 @@ void php_firebird_set_error(pdo_dbh_t *dbh, pdo_stmt_t *stmt, const char *state,
 		einfo->errmsg_length = 0;
 	}
 
-	if (H->isc_status && (H->isc_status[0] == 1 && H->isc_status[1] > 0)) {
+	if (H->isc_status[0] == 1 && H->isc_status[1] > 0) {
 		char buf[512];
 		size_t buf_size = sizeof(buf), read_len = 0;
 		ssize_t tmp_len;
@@ -557,7 +557,7 @@ void php_firebird_set_error(pdo_dbh_t *dbh, pdo_stmt_t *stmt, const char *state,
 
 		char sqlstate[sizeof(pdo_error_type)];
 		fb_sqlstate(sqlstate, H->isc_status);
-		if (sqlstate != NULL && strlen(sqlstate) < sizeof(pdo_error_type)) {
+		if (strlen(sqlstate) < sizeof(pdo_error_type)) {
 			strcpy(*error_code, sqlstate);
 			goto end;
 		}