[PATCH] cvs diff exit status

[Donald Sharp]

When the cvs diff command is run it attempts to return one of
three status codes to main:

0 - files same
1 - files different
2 - Some sort of error has occurred

main interprets and return codes > 0 as a cvs program failure.
I've changed diff.c to return only success or failure.  Success
is either the '0' or '1' state outlined above.  Failure is the
'2' state.

The reason that I have done this is because the current cvs
code returns EXIT_FAILURE for both '1' and '2' outlined above.
When I run a cvs diff command and check the programs return code
I have no way of telling whether cvs ran successfully or cvs found
some diffs without parsing the output from cvs as well.

Thanks!

donald

fix_diff
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