main/postmarketos-mkinitfs: tweak clean print (MR 6297)

Don't print the "Cleaning up old boot files..." message every time in
post-upgrade, only when it actually deletes files.

main/postmarketos-mkinitfs/postmarketos-mkinitfs.post-upgrade

@@ -4,9 +4,11 @@
 # appended kernel 'flavors'. Without doing this cleanup, /boot might be more
 # full than it needs to be, and things like copying files atomically in the new
 # mkinitfs may not have enough space to do the atomic copy
-echo "Cleaning up old boot files..."
 for f in /boot/boot.img-* /boot/initramfs-*-extra* /boot/initramfs-*[!-extra]; do
-        [ -f "$f" ] && rm -v "$f"
+	if [ -f "$f" ]; then
+		echo "mkinitfs: cleaning up old boot file: $f"
+		rm "$f"
+	fi
 done
 
 exit 0