media: fimc: check return value of clk_enable in runtime_resume

media: fimc: check return value of clk_enable in runtime_resume

In fimc_runtime_resume(), the return value of
clk_enable(fimc->clock[CLK_GATE]) was not checked. If enabling the clock
fails, subsequent register accesses (fimc_hw_reset() and capture/m2m
resume) may trigger a bus error or undefined behavior.

Fix this by checking the return value. If clk_enable() fails, return the
error immediately, preventing unsafe hardware access.

Signed-off-by: Zhaoyang Yu <2426767509@qq.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>