samba: fix code logic: $path was definetly not empty when checked

Assuming that path and dirpath are both empty, path becomes
	"/", which is not empty. The -z $path check after was useless.
	Changed the order of this two operations.

samba3/files/samba.init

@@ -124,10 +124,11 @@ smb_add_share() {
 	config_get dir_mask $1 dir_mask
 	config_get browseable $1 browseable
 	config_get dirpath $1 dirpath
-	path="$path/$dirpath"
 
 	[ -z "$name" -o -z "$path" ] && return
 
+	path="$path/$dirpath"
+
 	# restrict the shared paths to always be under /mnt/ tree
 	[ "${path:0:4}" == "/mnt" ] || path="/mnt/"$path