[krbdev.mit.edu #2891] Access to uninitialized variable in keytab.c in 1.3.6 code

[Ken Raeburn via RT]

This has been fixed in our source tree since about April, and the fix
will be in the 1.4 release.

I only checked briefly, but I don't think the uninitialized value is
actually used in any way other than passing it around to other functions
that don't use it....