remoteproc: debug: Remove unneeded NULL check

debugfs_remove_recursive will do NULL check, so remove
the redundant null check

Signed-off-by: Ding Xiang <dingxiang@cmss.chinamobile.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

drivers/remoteproc/remoteproc_debugfs.c

@@ -333,9 +333,6 @@ struct dentry *rproc_create_trace_file(const char *name, struct rproc *rproc,
 
 void rproc_delete_debug_dir(struct rproc *rproc)
 {
-	if (!rproc->dbg_dir)
-		return;
-
 	debugfs_remove_recursive(rproc->dbg_dir);
 }