vbox: remove unreachable error in virVBoxSnapshotConfLoadVboxFile

Both callers in the VirtualBox driver error out if the path
can't be fetched via VirtualBox APIs and abort on conversion error
from UTF-16 to UTF-8.

Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Laine Stump <laine@redhat.com>

src/vbox/vbox_snapshot_conf.c

@@ -576,12 +576,6 @@ virVBoxSnapshotConfLoadVboxFile(const char *filePath,
     ssize_t searchResultSize = 0;
     char *currentSnapshotAttribute = NULL;
 
-    if (filePath == NULL) {
-        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
-                       _("Filepath is Null"));
-        goto cleanup;
-    }
-
     machineDescription = g_new0(virVBoxSnapshotConfMachine, 1);
 
     xml = virXMLParse(filePath, NULL, NULL, NULL, &xPathContext, NULL, false);