Don't try to be too smart!

Revert "Do not offer usless actions"

This reverts commit 240b29fc12.

Believe it or not: the next DVD I burned after commiting the above patch
turned out to be... broken, and installer died without any useful warning!

anaconda/loader/cdinstall.c

@@ -237,8 +237,6 @@ static void queryCDMediaCheck(char *dev, char *location) {
     int rc;
     char *stage2loc;
 
-    return; // Nobody really checks the DVD before the install! Skip it!
-
     /* dont bother to test in automated installs */
     if (FL_KICKSTART(flags) && !FL_MEDIACHECK(flags))
         return;