[patch/testsuite] gdb_file_cmd: enhance return value

[Michael Chastain]

> Have you commited these changes to the testcase already? I just checked
> out cvs -z9 -d :ext:manjo@sources.redhat.com:/cvs/src co src/gdb and I did
> not see changes to the testcases. Am I checking out the correct tree??

You've got the right tree.

I changed the callers only enough to work with the new return
value of { "" } on success.  I didn't do the { "" nodebug } part
in the callers.

I could have done that part too -- it would be less checkins to gdb
overall and less work for you.  But it felt kind of funny just taking
over like that.  So I didn't glom that part; I left that for you to do,
to help bring up your skills more, build the gdb team, that kinda stuff.

Michael