Initialize previously uninitialized values

src/parser.c

@@ -98,6 +98,7 @@ struct SyntaxElement* parse(FILE* file) {
 			if (symbol == '"') {
 				if (string == NULL) {
 					string = malloc(sizeof(struct Extstring));
+					string->next = NULL;
 				}
 				instring = false;
 				syntaxtree->type = STRING;
@@ -110,6 +111,7 @@ struct SyntaxElement* parse(FILE* file) {
 				if (string == NULL) {
 					string = malloc(sizeof(struct Extstring));
 					string->symbol = symbol;
+					string->next = NULL;
 					continue;
 				}
 				es_addsymbol(string, symbol);
@@ -158,6 +160,7 @@ struct SyntaxElement* parse(FILE* file) {
 				default:
 					token = malloc(sizeof(struct Extstring));
 					token->symbol = symbol;
+					token->next = NULL;
 					intoken = true;
 					break;
 			}