parthelper: Don't leak @canonical_path

The @canonical_path variable holds canonicalized path passed as
argv[1]. The canonicalized path is obtained either via
virFileResolveLink() or plain g_strdup(). Nevertheless, in both
cases it must be freed.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>

src/storage/parthelper.c

@@ -62,7 +62,7 @@ int main(int argc, char **argv)
     PedPartition *part;
     int cmd = DISK_LAYOUT;
     const char *path;
-    char *canonical_path;
+    g_autofree char *canonical_path = NULL;
     const char *partsep;
     bool devmap_partsep = false;