counter: stm32-timer-cnt: Add check for clk_enable()

counter: stm32-timer-cnt: Add check for clk_enable()

[ Upstream commit 842c3755a6bfbfcafa4a1438078d2485a9eb1d87 ]

Add check for the return value of clk_enable() in order to catch the
potential exception.

Fixes: c5b8425514da ("counter: stm32-timer-cnt: add power management support")
Fixes: ad29937e206f ("counter: Add STM32 Timer quadrature encoder")
Signed-off-by: Jiasheng Jiang <jiashengjiangcool@gmail.com>
Link: https://lore.kernel.org/r/20241104191825.40155-1-jiashengjiangcool@gmail.com
Signed-off-by: William Breathitt Gray <wbg@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>