[PATCH] ios: Improve error handling of ios_open.

[Egeyar Bagcioglu]

Hello!

This patch needs a good review!

Some interesting points:
- I included errno.h in ios-dev-file.c to be able to distinguish fopen 
failures.
- Regarding this patch and the previous: The line between EINVAL and 
EFLAGS is a bit blurry. I used the former for errors with get from 
system calls etc, and the latter for our own checks on the flags. We can 
opt to merge the two as well.

Regards,
Ege

ios_open_error_handling.patch
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