Fix printf infinite loop

[alx-sima]

Fix printf infinite loop (#5818) while there are more parameters than format arguments.

Still WiP:

• print stdout before stderr
• add test

[sudhackar]

The current change would also break this.

$ printf %c a b c d e
abcde

[alx-sima]

@sudhackar this should be fixed now. Passing all the tests.

[alexandruradovici]

Please rebase it, make sure to run cargo fmt on your code, send this to upstream and place a link to it here.