Pass a missing argument to fprintf()
Mark krb5_store_some/all_creds as static

Both krb5_store_some_creds and krb5_store_all_creds are only defined and
called from one source file, so mark them as static functions.
Remove "other" creds arrays, which are always NULL
Make show_credential static, too
Remove unused compare_creds() function
Remove a redundant copy of an argument pointer
Remove no-longer-used krb5_ccache_overwrite()
Removed no-longer-used krb5_find_princ_in_cache()
Fix minor memory leak
Update comments, fix a couple of typos