gsm48_rx_mm_auth_resp(): pass is_r99 from classmark, not response size

Do not interpret the SRES/RES length returned in the auth response as the R99
capability bit, instead determine it from the actual Classmark information
associated with the conn.

This fixes the is_r99 flag passed in to vlr_subscr_rx_auth_resp(), which ends
up in the struct vlr_auth_resp_par dispatched to the auth_fi and influences the
authentication acceptance.

Though the effect of a wrongly-set-to-false R99 flag is not harmful in this
code path, let's not get this confused.

Change-Id: Ib7f7d89a8b9455d2c022d53d74328fa7488577f4
1 file changed