Fix syscall assertion when input file does not exist

[dbatyai]

Errors should be handled by caller instead of exiting.

JerryScript-DCO-1.0-Signed-off-by: Dániel Bátyai dbatyai@inf.u-szeged.hu

[akosthekiss]

It seems that you've removed LIBC_EXIT_ON_ERROR from the linux port only. I feel that we should keep the darwin port in sync as well.
Moreover, once the suggested changes are applied, will there be any use of LIBC_EXIT_ON_ERROR? (If not, that can go away too.)

[dbatyai]

I've updated the darwin port, and removed LIBC_EXIT_ON_ERROR entirely.

[zherczeg]

LGTM

[akosthekiss]

LGTM (FWIW)

[akosthekiss]

(Please, update to current master.)