apkgrel: tweaks to loops, add quotes

apkgrel.in

@@ -43,9 +43,9 @@ do_set() {
 
 do_add () {
 	local f= old=
-	for f in "$@"; do
+	for f; do
 		[ -n "$only_clean_git" ] \
-			&& [ -n "$(git diff --name-only $f)" ] \
+			&& [ -n "$(git diff --name-only "$f")" ] \
 			&& continue
 		[ -d "$f" ] && f="$f/APKBUILD"
 		old=$(show_plain "$f")
@@ -57,7 +57,7 @@ do_add () {
 do_verify() {
 	[ -n "$force" ] && return 0
 	local f= rc=0
-	for f in "$@"; do
+	for f; do
 		[ -d "$f" ] && f="$f/APKBUILD"
 		if ! grep -q '^pkgrel=[0-9]' "$f"; then
 			echo "$f: Has no proper pkgrel" >&2