[LTP] [PATCH] Make SAFE_* calls more informative when failing

[Mats L. <mat...@en...>]

When debugging failing test cases I often missed what parameters were used in
those SAFE_* calls. This patch is meant to fix this.

The output has been "standardized" into the following format:
<file>:<line>: <func>(<params>) <error message>

E.g.:
test.c:130: chdir(mydir) failed

This will then be followed by the usual errno stuff if applicable.

The code compiles, but I haven't figured out a good way of testing it. The
changes are pretty simple however.

Regards
Mats Liljegren