Fix crash on some defers

Fixes golangci/golangci-lint#608

Author: jirfag

passes/bodyclose/bodyclose.go

@@ -225,7 +225,7 @@ func (r *runner) getBodyOp(instr ssa.Instruction) (*ssa.UnOp, bool) {
 func (r *runner) isCloseCall(ccall ssa.Instruction) bool {
 	switch ccall := ccall.(type) {
 	case *ssa.Defer:
-		if ccall.Call.Method.Name() == r.closeMthd.Name() {
+		if ccall.Call.Method != nil && ccall.Call.Method.Name() == r.closeMthd.Name() {
 			return true
 		}
 	case *ssa.Call:

passes/bodyclose/testdata/src/a/defer_crash.go

@@ -0,0 +1,11 @@
+package a
+
+import (
+	"io"
+	"net/http"
+)
+
+func testNoCrashOnDefer() {
+	resp, _ := http.Get("https://example.com") // want "response body must be closed"
+	defer func(body io.ReadCloser) {}(resp.Body)
+}