Create firmware directory if it doesn't exist

src/freedombone-utils-wifi

@@ -49,7 +49,10 @@ function setup_wifi_atheros {
         fi
     fi
     if [ ! -d /lib/firmware ]; then
-        return
+        mkdir /lib/firmware
+        if [ ! -d /lib/firmware ]; then
+            return
+        fi
     fi
     if [ -f /lib/firmware/htc_9271.fw ]; then
         return