gogensig:fix unexpect receiver reinit goplus#67

cmd/gogensig/convert/_testdata/receiver/conf/llcppg.cfg

@@ -0,0 +1,5 @@
+{
+  "name": "comment",
+  "include": ["temp.h","use.h"],
+  "cplusplus":false
+}

cmd/gogensig/convert/_testdata/receiver/conf/llcppg.symb.json

@@ -0,0 +1,7 @@
+[
+  {
+    "mangle": "ares_dns_addr_to_ptr",
+    "c++": "ares_dns_addr_to_ptr(const struct ares_addr *)",
+    "go": "(*aresAddr).AresDnsAddrToPtr"
+  }
+]

cmd/gogensig/convert/_testdata/receiver/gogensig.expect

@@ -0,0 +1,43 @@
+===== temp.go =====
+package receiver
+
+import (
+	"github.com/goplus/llgo/c"
+	_ "unsafe"
+)
+
+type X__Uint32T c.Uint
+type InAddrT X__Uint32T
+
+type InAddr struct {
+	SAddr InAddrT
+}
+
+type AresIn6Addr struct {
+	X_S6Un struct {
+		X_S6U8 [16]int8
+	}
+}
+
+===== use.go =====
+package receiver
+
+import _ "unsafe"
+
+type AresAddr struct {
+	Family c.Int
+	Addr   struct {
+		Addr6 AresIn6Addr
+	}
+}
+// llgo:link (*aresAddr).AresDnsAddrToPtr C.ares_dns_addr_to_ptr
+func (p *AresAddr) AresDnsAddrToPtr() *int8 {
+	return nil
+}
+
+===== llcppg.pub =====
+__uint32_t X__Uint32T
+ares_addr AresAddr
+ares_in6_addr AresIn6Addr
+in_addr InAddr
+in_addr_t InAddrT

cmd/gogensig/convert/_testdata/receiver/hfile/temp.h

@@ -0,0 +1,22 @@
+typedef unsigned int __uint32_t;
+typedef __uint32_t in_addr_t;
+struct in_addr {
+    in_addr_t s_addr;
+};
+
+struct ares_in6_addr {
+    union {
+        unsigned char _S6_u8[16];
+    } _S6_un;
+};
+
+struct ares_addr {
+    int family;
+
+    union {
+        struct in_addr addr4;
+        struct ares_in6_addr addr6;
+    } addr;
+};
+
+#include "use.h"

cmd/gogensig/convert/_testdata/receiver/hfile/use.h

@@ -0,0 +1,2 @@
+
+char *ares_dns_addr_to_ptr(const struct ares_addr *addr);

cmd/gogensig/convert/type.go

@@ -211,9 +211,13 @@ func (p *TypeConv) ToSignature(funcType *ast.FuncType, recv *types.Var) (*types.
 	ctx := p.ctx
 	p.ctx = Param
 	defer func() { p.ctx = ctx }()
-	params, variadic, err := p.fieldListToParams(funcType.Params)
+	var params *types.Tuple
+	var variadic bool
+	var err error
 	if recv != nil {
 		params, variadic, err = p.fieldListToParams(&ast.FieldList{List: funcType.Params.List[1:]})
+	} else {
+		params, variadic, err = p.fieldListToParams(funcType.Params)
 	}
 	if err != nil {
 		return nil, err