linuxrc: do not look for ${REAL_INIT} inside the mounted partition

If ${REAL_INIT} is on a separate partition, the check will erroneously
fail. Don't try to be too smart and fix bug #479730

defaults/linuxrc

@@ -500,14 +500,7 @@ do
 		# else not a good root and start over.
 		if [ "$?" = '0' ]
 		then
-			if [ -d ${NEW_ROOT}/dev -a -x "${NEW_ROOT}${REAL_INIT:-/sbin/init}" ] || [ "${REAL_ROOT}" = "/dev/nfs" ]
-			then
-				break
-			else
-				bad_msg "The filesystem mounted at ${REAL_ROOT} does not appear to be a valid /, try again"
-				got_good_root=0
-				REAL_ROOT=''
-			fi
+			break
 		else
 			bad_msg "Could not mount specified ROOT, try again"
 			got_good_root=0