Removing unused code with a TODO that no longer needs to be done

Signed-off-by: Kate Heddleston <kate.heddleston@gmail.com>

pkg/system/exitcode.go

@@ -17,17 +17,3 @@ func GetExitCode(err error) (int, error) {
 	}
 	return exitCode, fmt.Errorf("failed to get exit code")
 }
-
-// ProcessExitCode process the specified error and returns the exit status code
-// if the error was of type exec.ExitError, returns nothing otherwise.
-func ProcessExitCode(err error) (exitCode int) {
-	if err != nil {
-		var exiterr error
-		if exitCode, exiterr = GetExitCode(err); exiterr != nil {
-			// TODO: Fix this so we check the error's text.
-			// we've failed to retrieve exit code, so we set it to 127
-			exitCode = 127
-		}
-	}
-	return
-}