MIPS: ralink: add missing comment in irq driver
MIPS: ralink: add missing comment in irq driver

Trivial patch that adds a comment that makes the code more readable.

Signed-off-by: John Crispin <be6487f9df4dce44a640672d6c07330104d43593@openwrt.org>
Acked-by: Gabor Juhos <0b85b0feb94c9a44e8676965f48a70291ba74edb@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/5168/

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