x86/paravirt: Fix native_patch()

x86/paravirt: Fix native_patch()

While chasing a regression I noticed we potentially patch the wrong
code in native_patch().

If we do not select the native code sequence, we must use the default
patcher, not fall-through the switch case.

Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Alok Kataria <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Chris Wright <[email protected]>
Cc: Jeremy Fitzhardinge <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Pan Xinhui <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: Peter Anvin <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Rusty Russell <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: kernel test robot <[email protected]>
Fixes: 3cded4179481 ("x86/paravirt: Optimize native pv_lock_ops.vcpu_is_preempted()")
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>