elf_init open a elf file , if both enabled
CONFIG_NSH_BUIlTAPPS and CONFIG_NSH_FILE_APPS ,
elf_init will read elf file in /bin directory, but
that length is zero , elf_read failed return and NOT
close elf fd, so this line MUST be return to errout_with_init
Liio Chen
468e08c1b4