Removed NOP line of code from krb5_fcc_next_cred()

Removed NOP line of code from krb5_fcc_next_cred()

cursor = (krb5_cc_cursor *) fcursor;

does nothing for a function with a prototype

krb5_fcc_next_cred(krb5_context context, krb5_ccache id,
	krb5_cc_cursor *cursor, krb5_creds *creds)

The correct line of code would be:

*cursor = (krb5_cc_cursor) fcursor;

Except it isn't necessary because fcursor isn't modified
by krb5_fcc_next_cred().  Looks like code was copied from
krb5_fcc_start_seq_get() and since the line was a NOP
no one noticed it.

ticket: new

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@20085 dc483132-0cff-0310-8789-dd5450dbe970