Extcon build failure in next

[Tony Lindgren]

* Tony Lindgren <tony at atomide.com> [160629 22:41]:
> Hi Chanwoo,
> 
> Looks like current Linux next fails to build with at least
> omap2plus_defconfig because of:
> 
> ERROR: "extcon_dev_allocate" [drivers/extcon/devres.ko] undefined!
> scripts/Makefile.modpost:91: recipe for target '__modpost' failed
> make[1]: *** [__modpost] Error 1
> Makefile:1163: recipe for target 'modules' failed
> make: *** [modules] Error 2
> Kernel build failed
> 
> Probably extcon_dev_allocate just needs EXPORT_SYMBOL_GPL?

Also I'm seeing:

drivers/extcon/extcon.c: In function 'extcon_register_notifier':
drivers/extcon/extcon.c:455:6: warning: 'idx' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if (idx >= 0) {
         ^

Regards,

Tony