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initramfs-init: fix posix -f glob

SC2144 (error): -f doesn't work with globs. Use a for loop.

--- a/initramfs-init.in

+++ b/initramfs-init.in

@@ -773,11 +773,16 @@

 fi

 # enable support for modloop verification

-if [ -f "$ROOT"/var/cache/misc/*modloop*.SIGN.RSA.*.pub ]; then

+for _pubkey in "$ROOT"/var/cache/misc/*modloop*.SIGN.RSA.*.pub; do

+	# check only if the glob matched something

+	[ -f "$_pubkey" ] || continue

+

+	# then do it in one iteration anyway

 	mkdir -p "$sysroot"/var/cache/misc

 	cp "$ROOT"/var/cache/misc/*modloop*.SIGN.RSA.*.pub "$sysroot"/var/cache/misc

 	pkgs="$pkgs openssl"

-fi

+	break

+done

 apkflags="--initramfs-diskless-boot --progress"

 if [ -z "$MAC_ADDRESS" ]; then