lib.sh: fix redundancy in download()

it was only downloading the main url, even when
it should use the backup.

fix it by actually using the for loop variable.

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

include/lib.sh

@@ -235,10 +235,10 @@ download()
 	x_ mkdir -p "${3%/*}"
 	for url in "$1" "$2"; do
 		[ "$dl_fail" = "n" ] && break
-		[ -z "$1" ] && continue
+		[ -z "$url" ] && continue
 		x_ rm -f "$3"
-		curl --location --retry 3 -A "$_ua" "$1" -o "$3" || \
-		    wget --tries 3 -U "$_ua" "$1" -O "$3" || continue
+		curl --location --retry 3 -A "$_ua" "$url" -o "$3" || \
+		    wget --tries 3 -U "$_ua" "$url" -O "$3" || continue
 		vendor_checksum "$4" "$3" || dl_fail="n"
 	done
 	[ "$dl_fail" = "y" ] && $err "$1 $2 $3 $4: file missing"; return 0