basic: add new helper call empty_or_dash_to_null()

We have a function like this at two places already. Let's unify it in
one generic location and let's port a number of users over.

1 files changed, 2 insertions, 4 deletions

diff --git a/src/import/import-fs.c b/src/import/import-fs.c
index 9f3ef0826c..04344492c8 100644
--- a/src/import/import-fs.c
+++ b/src/import/import-fs.c
@@ -117,15 +117,13 @@ static int import_fs(int argc, char *argv[], void *userdata) {
 
         if (argc >= 2)
                 path = argv[1];
-        if (empty_or_dash(path))
-                path = NULL;
+        path = empty_or_dash_to_null(path);
 
         if (argc >= 3)
                 local = argv[2];
         else if (path)
                 local = basename(path);
-        if (empty_or_dash(local))
-                local = NULL;
+        local = empty_or_dash_to_null(local);
 
         if (local) {
                 if (!machine_name_is_valid(local)) {