storage: Don't check the output of virGetUserRuntimeDirectory()

virGetUserRuntimeDirectory() *never* *ever* returns NULL, making the
checks for it completely unnecessary.

Signed-off-by: Fabiano Fidêncio <fidencio@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>

src/storage/storage_driver.c

@@ -278,8 +278,6 @@ storageStateInitialize(bool privileged,
     } else {
         configdir = virGetUserConfigDirectory();
         rundir = virGetUserRuntimeDirectory();
-        if (!rundir)
-            goto error;
 
         driver->configDir = g_strdup_printf("%s/storage", configdir);
         driver->autostartDir = g_strdup_printf("%s/storage/autostart", configdir);