Add errcheck excludes for fomatter

Author: bluekeyes

.golangci.yml

@@ -19,6 +19,12 @@ linters:
 issues:
   exclude-use-default: false
 
-linter-settings:
+linters-settings:
   goimports:
     local-prefixes: github.com/bluekeyes/go-gitdiff
+  errcheck:
+    exclude-functions:
+      - (*github.com/bluekeyes/go-gitdiff/gitdiff.formatter).Write
+      - (*github.com/bluekeyes/go-gitdiff/gitdiff.formatter).WriteString
+      - (*github.com/bluekeyes/go-gitdiff/gitdiff.formatter).WriteByte
+      - fmt.Fprintf(*github.com/bluekeyes/go-gitdiff/gitdiff.formatter)

gitdiff/base85_test.go

@@ -108,8 +108,9 @@ func FuzzBase85Roundtrip(f *testing.F) {
 		out := make([]byte, n)
 
 		base85Encode(dst, in)
-		base85Decode(out, dst)
-
+		if err := base85Decode(out, dst); err != nil {
+			t.Fatalf("unexpected error decoding base85 data: %v", err)
+		}
 		if !bytes.Equal(in, out) {
 			t.Errorf("decoded data differed from input data:\n   input: %x\n  output: %x\nencoding: %s\n", in, out, string(dst))
 		}