gsm_08_08: fix unreachable code in parse_powercap()

The function parse_powercap() contains a nested switch case statement
that is used to populate the variables lu and pwr_lev. Those variables
are used at the bottom of the function later. Unfortunately the (outer)
switch case that consumes the pdisc variable does not put a break; at
the end of its only case "GSM48_PDISC_MM", which eventually causes a
fall through to the default case, which simply returns. Since this can
not be intended, lets add a break to make the bottom code reachable in
case lu and pwr_lev are successfully populated.

Change-Id: I48331cca784d8fa3a5904f2c4cf1555622b319e8
Fixes: CID#214886
1 file changed