fix temperature display

luci/luci-app-qmodem/root/usr/share/qmodem/quectel.sh

@@ -305,11 +305,14 @@ get_temperature()
     local line=1
     QTEMP=$(at ${at_port} ${at_command} | grep "+QTEMP:")
     for line in $( echo -e "$QTEMP" ); do
-        temp=$(echo $line | grep -o "[0-9]\{1,3\}")
+        templine=$(echo $line | grep -o "[0-9]\{1,3\}")
+        for tmp in $(echo $templine); do
+            [ "$tmp" -gt 0 ] && [ "$tmp" -lt 255 ] && temp=$tmp
             if [ -n "$temp" ]; then
                 break
             fi
         done
+    done
 	if [ -n "$temp" ]; then
 		temp="${temp}$(printf "\xc2\xb0")C"
 	fi