pppd: Fix auth_number() to handle wildcards correctly

pppd: Fix auth_number() to handle wildcards correctly

Previously auth_number treated all entries in the permitted_numbers
list as if they were wildcards, i.e., as ending in '*', even if there
was no '*'.  This fixes it to only treat entries ending in '*' as
wildcards; without the '*', remote_number has to match the whole entry
exactly.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>