[ Upstream commit 5dc63fdc ]

Here, Clock enable can failed. So adding an error check for
clk_prepare_enable.

tj: minor style updates
Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>