if argv[0] is NULL, dont try to parse it and subsequently crash ... found by running execve05 ltp test on blackfin ([#4194])
if argv[0] is NULL, dont try to parse it and subsequently crash ... found by running execve05 ltp test on blackfin ([#4194])

joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc