hw-breakpoints: Handle bad modify_user_hw_breakpoint off-case return value
hw-breakpoints: Handle bad modify_user_hw_breakpoint off-case return value

While converting modify_user_hw_breakpoint() return value, we
forgot to handle the off-case. It's not returning a pointer
anymore.

This solves the build warning reported by Stephen Rothwell against
linux-next.

Reported-by: Stephen Rothwell <4bf0fb350827ce8d86875e76c923a478597c3cef@canb.auug.org.au>
Signed-off-by: Frederic Weisbecker <e8a1bf9163cb25e93cfd6540f223b3872ea7ee55@gmail.com>
Cc: Prasad <d7fbabb3289b145a0f256d6596e2e43e9ecb9986@linux.vnet.ibm.com>
LKML-Reference: <1260529122-6260-1-git-send-regression-e8a1bf9163cb25e93cfd6540f223b3872ea7ee55@gmail.com>
Signed-off-by: Ingo Molnar <9dbbbf0688fedc85ad4da37637f1a64b8c718ee2@elte.hu>
Cc: Prasad <d7fbabb3289b145a0f256d6596e2e43e9ecb9986@linux.vnet.ibm.com>

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