[U-Boot] Script with 'if run' don't work as expected

Hi,

a script with 'if run' don't work as expect. I have test it on an omap3_overo board.

The following script always prints true: setenv testcmd false; if run testcmd; then echo "true"; fi;

This could be fixed by reverting commit 1992dbfdb9886c3dfc4a505091895c851f736f3a: Make 'run' use run_command_list() instead of run_command()

Kind regards, Stefan