leds: Fix trigger registration race
leds: Fix trigger registration race

Fix a race during trigger registration where we could try and use a lock
before it was initialised.

Signed-off-by: Richard Purdie <a03894c799ea916bd571ce8f12ed88f6fb3400f7@linux.intel.com>

KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs