modemmanager: suppress mm_log debug messages by default

The log is filled with 'debug' messages. This is not necessary and is
only normaly needed during development. To suppress this message, check
whether the level is 'debug' and if so, suppress it. If this message is
required again, the message can be generated by commenting out this line.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

net/modemmanager/files/modemmanager.common

@@ -21,6 +21,8 @@ MODEMMANAGER_EVENTS_CACHE="${MODEMMANAGER_RUNDIR}/events.cache"
 
 mm_log() {
 	local level="$1"; shift
+
+	[ "${level}" = "debug" ] && return
 	logger -p "daemon.${level}" -t "ModemManager[$$]" "hotplug: $*"
 }