Update read_entrie_file function

src/io.c

@@ -33,7 +33,9 @@ u64 get_file_length(FILE *fp) {
   return length;
 }
 
-void read_entire_file(void *dst, u64 length, FILE *fp) {
+void read_entire_file(void *dst, FILE *fp) {
+  u64 length = get_file_length(fp);
+
   u64 current = ftell(fp);
 
   fseek(fp, 0, SEEK_SET);