roms: re-introduce accidentally disabled check

i disabled a check in the script, while testing a prior
modification. re-introoduce the check, which is put there
to yield an error condition if no targets were compiled.

Signed-off-by: Leah Rowe <leah@libreboot.org>

script/roms

@@ -45,7 +45,7 @@ main()
 		    && targets="$targets, $x"; continue
 	done
 
-#	[ -z "$targets" ] && $err "No ROM images were compiled"
+	[ -z "$targets" ] && $err "No ROM images were compiled"
 	printf "Check these ROM directories in bin/: %s\n" "${targets#, }"
 	printf "DO NOT flash images from elf/ - use bin/ instead. ALSO:\n"
 	printf "%s\n" "$kbnotice"