internal/imports: use a more straightforward return value

Change-Id: Ibd8249da636a854dd1a53c047e3d215ef45c911f
Reviewed-on: https://go-review.googlesource.com/c/tools/+/653196
Reviewed-by: Michael Pratt <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>
Auto-Submit: Ian Lance Taylor <[email protected]>

Author: cuishuang

internal/imports/fix.go

@@ -559,7 +559,7 @@ func fixImportsDefault(fset *token.FileSet, f *ast.File, filename string, env *P
 		return err
 	}
 	apply(fset, f, fixes)
-	return err
+	return nil
 }
 
 // getFixes gets the import fixes that need to be made to f in order to fix the imports.