fixed uninit err in backend

src/llvm/llvm-ir/types.c

@@ -321,7 +321,7 @@ BackendError impl_types(LLVMBackendCompileUnit* unit, LLVMGlobalScope* scope,
     gpointer key = NULL;
     gpointer val = NULL;
 
-    BackendError err;
+    BackendError err = SUCCESS;
 
     while (g_hash_table_iter_next(&iterator, &key, &val) != FALSE) {
         err = impl_type_define(unit, (Typedefine*) val, (const char*)key, scope);

tests/input_file/test.gem

@@ -1,6 +1,4 @@
 
-import "std.io"
-
-fun main {
-    print("Hello, World!!!")
-}
+fun main(out int: ret) {
+    ret = 56 as int
+}