Correct bug for in array of struct.

for issue-#1

Author: joeybloggs

README.md

@@ -1,7 +1,7 @@
 Package form
 ============
 <img align="right" src="https://raw.githubusercontent.com/go-playground/form/master/logo.jpg">
-![Project status](https://img.shields.io/badge/version-1.2.0-green.svg)
+![Project status](https://img.shields.io/badge/version-1.2.1-green.svg)
 [![Build Status](https://semaphoreci.com/api/v1/joeybloggs/form/branches/master/badge.svg)](https://semaphoreci.com/joeybloggs/form)
 [![Coverage Status](https://coveralls.io/repos/github/go-playground/form/badge.svg?branch=master)](https://coveralls.io/github/go-playground/form?branch=master)
 [![Go Report Card](https://goreportcard.com/badge/github.com/go-playground/form)](https://goreportcard.com/report/github.com/go-playground/form)

decoder.go

@@ -152,7 +152,10 @@ func (d *decoder) traverseStruct(v reflect.Value, namespace string) (set bool) {
 				nn = namespace + namespaceSeparator + key
 			}
 
-			set = d.setFieldByType(v.Field(i), nn, 0)
+			if d.setFieldByType(v.Field(i), nn, 0) {
+				set = true
+			}
+
 		}
 	} else {
 		s, ok := d.d.structCache.Get(typ)
@@ -168,7 +171,9 @@ func (d *decoder) traverseStruct(v reflect.Value, namespace string) (set bool) {
 				nn = namespace + namespaceSeparator + f.name
 			}
 
-			set = d.setFieldByType(v.Field(f.idx), nn, 0)
+			if d.setFieldByType(v.Field(f.idx), nn, 0) {
+				set = true
+			}
 		}
 	}
 

form_test.go

@@ -797,3 +797,36 @@ func TestStructRecursion(t *testing.T) {
 	Equal(t, test.Nested.Value, "value")
 	Equal(t, test.Nested.Nested, nil)
 }
+
+func TestFormDecode(t *testing.T) {
+
+	type Struct2 struct {
+		Foo string
+		Bar string
+	}
+
+	type Struct2Wrapper struct {
+		InnerSlice []Struct2
+	}
+
+	sliceValues := map[string][]string{
+		"InnerSlice[0].Foo": {"foo-is-set"},
+	}
+
+	singleValues := map[string][]string{
+		"Foo": {"foo-is-set"},
+	}
+
+	fd := NewDecoder()
+
+	dst := Struct2Wrapper{}
+	err := fd.Decode(&dst, sliceValues)
+	Equal(t, err, nil)
+	NotEqual(t, dst.InnerSlice, nil)
+	Equal(t, dst.InnerSlice[0].Foo, "foo-is-set")
+
+	dst2 := Struct2{}
+	err = fd.Decode(&dst2, singleValues)
+	Equal(t, err, nil)
+	Equal(t, dst2.Foo, "foo-is-set")
+}