Update files based on go lint

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

filters/adaptor.go

@@ -8,8 +8,10 @@ type Adaptor interface {
 	Field(fieldpath []string) (value string, present bool)
 }
 
+// AdapterFunc allows implementation specific matching of fieldpaths
 type AdapterFunc func(fieldpath []string) (string, bool)
 
+// Field returns the field name and true if it exists
 func (fn AdapterFunc) Field(fieldpath []string) (string, bool) {
 	return fn(fieldpath)
 }

filters/filter.go

@@ -58,22 +58,28 @@ import (
 	"github.com/containerd/containerd/log"
 )
 
+// Filter matches specific resources based the provided filter
 type Filter interface {
 	Match(adaptor Adaptor) bool
 }
 
+// FilterFunc is a function that handles matching with an adaptor
 type FilterFunc func(Adaptor) bool
 
+// Match matches the FilterFunc returning true if the object matches the filter
 func (fn FilterFunc) Match(adaptor Adaptor) bool {
 	return fn(adaptor)
 }
 
+// Always is a filter that always returns true for any type of object
 var Always FilterFunc = func(adaptor Adaptor) bool {
 	return true
 }
 
+// Any allows multiple filters to be matched aginst the object
 type Any []Filter
 
+// Match returns true if any of the provided filters are true
 func (m Any) Match(adaptor Adaptor) bool {
 	for _, m := range m {
 		if m.Match(adaptor) {
@@ -84,8 +90,10 @@ func (m Any) Match(adaptor Adaptor) bool {
 	return false
 }
 
+// All allows multiple filters to be matched aginst the object
 type All []Filter
 
+// Match only returns true if all filters match the object
 func (m All) Match(adaptor Adaptor) bool {
 	for _, m := range m {
 		if !m.Match(adaptor) {

filters/filter_test.go

@@ -243,10 +243,9 @@ func TestFilters(t *testing.T) {
 				}
 
 				return
-			} else {
-				if err != nil {
-					t.Fatal(err)
-				}
+			}
+			if err != nil {
+				t.Fatal(err)
 			}
 
 			if filter == nil {

filters/scanner.go

@@ -67,9 +67,8 @@ func (s *scanner) next() rune {
 	if r == utf8.RuneError {
 		if w > 0 {
 			return tokenIllegal
-		} else {
-			return tokenEOF
 		}
+		return tokenEOF
 	}
 
 	if r == 0 {