sde-create-iso: Resolved "if $x; then" bug (reminder bash is not VB)

bin/sde-create-iso

@@ -138,7 +138,7 @@ bootoptions="${bootoptions}"`echo "${dirs}" | grep '^BOOTx ' |  cut -f2- -d ' '`
 udf=
 [[ "$format" = "udf" ]] && udf="-udf"
 
-if "$x"; then
+if [ "$x" = "true" ]; then
 	echo_abort 1 "$out_size is bigger than $size and I am too dumb to split across multiple media :("
 else
 	mkisofs "$udf" -r -T -J -l -A "OpenSDE - Disk 1" -publisher 'OpenSDE System Develop Environment - http://www.opensde.org'  \