cleanup: go vet and golint run (#736)

* cleanup: go vet and golint run

Various cleanups trickered by go vet and golint.

* Fix tests and lowercase all errors

Lowercase all errors, some tests in kubernetes use errors from
kubernetes which do start with a capital letter.

1 files changed, 2 insertions, 1 deletions

diff --git a/middleware/cache/freq/freq.go b/middleware/cache/freq/freq.go
index 528eedc1c..4e7f7722e 100644
--- a/middleware/cache/freq/freq.go
+++ b/middleware/cache/freq/freq.go
@@ -7,6 +7,7 @@ import (
 	"time"
 )
 
+// Freq tracks the frequence of things.
 type Freq struct {
 	// Last time we saw a query for this element.
 	last time.Time
@@ -21,7 +22,7 @@ func New(t time.Time) *Freq {
 	return &Freq{last: t, hits: 0}
 }
 
-// Updates updates the number of hits. Last time seen will be set to now.
+// Update updates the number of hits. Last time seen will be set to now.
 // If the last time we've seen this entity is within now - d, we increment hits, otherwise
 // we reset hits to 1. It returns the number of hits.
 func (f *Freq) Update(d time.Duration, now time.Time) int {