Remove newlines between braces (#4279)

These are found with: `pcregrep -M "}\n\n}" **/*.go`
Sometimes a unneeded newline is inserted, remove those.

Signed-off-by: Miek Gieben <miek@miek.nl>

test/metric_naming_test.go

@@ -37,7 +37,6 @@ func TestMetricNaming(t *testing.T) {
 			t.Fatalf("A slice of Problems indicating any issues found in the metrics stream: %s", problems)
 		}
 	}
-
 }
 
 type validMetricWalker struct {