fix for incorrect checking of return code, which causes syntax errors

Signed-off-by: Allan McRae <allan@archlinux.org>
Signed-off-by: Dan McGee <dan@archlinux.org>

scripts/makepkg.sh.in

@@ -693,10 +693,10 @@ extract_sources() {
 		local ret=0
 		msg2 "$(gettext "Extracting %s with %s")" "$file" "$cmd"
 		if [[ $cmd = bsdtar ]]; then
-			$cmd -xf "$file" || ret=?
+			$cmd -xf "$file" || ret=$?
 		else
 			rm -f "${file%.*}"
-			$cmd -dcf "$file" > "${file%.*}" || ret=?
+			$cmd -dcf "$file" > "${file%.*}" || ret=$?
 		fi
 		if (( ret )); then
 			error "$(gettext "Failed to extract %s")" "$file"