Don't check for stutter of method names.

Method names are used object-qualified, not package-qualified.
diff --git a/lint.go b/lint.go
index d6e72a2..377c407 100644
--- a/lint.go
+++ b/lint.go
@@ -265,11 +265,11 @@
 			return true
 		case *ast.FuncDecl:
 			f.lintFuncDoc(v)
-			thing := "func"
-			if v.Recv != nil {
-				thing = "method"
+			if v.Recv == nil {
+				// Only check for stutter on functions, not methods.
+				// Method names are not used package-qualified.
+				f.checkStutter(v.Name, "func")
 			}
-			f.checkStutter(v.Name, thing)
 			// Don't proceed inside funcs.
 			return false
 		case *ast.TypeSpec:
diff --git a/testdata/stutter.go b/testdata/stutter.go
index 997d4b8..3e6b13e 100644
--- a/testdata/stutter.go
+++ b/testdata/stutter.go
@@ -12,9 +12,14 @@
 }
 
 // Donut is a delicious treat.
-type Donut interface{} // ok because it is the whole name
+type Donut struct{} // ok because it is the whole name
 
 // Donuts are great, aren't they?
 type Donuts []Donut // ok because it didn't start a new word
 
 type donutGlaze int // ok because it is unexported
+
+// DonutMass reports the mass of a donut.
+func (d *Donut) DonutMass() (grams int) { // okay because it is a method
+	return 38
+}