Fixed EventUnregister annotation
Fixed EventUnregister annotation

Warning was:
C28251
Inconsistent annotation for function: this instance has an error
Inconsistent annotation for 'EventUnregister': this instance has no
annotations.
See c:\program files (x86)\windows
kits\8.1\include\shared\evntprov.h(192).

OSVR/UIforETW,u-engine/UIforETW,ariccio/UIforETW,mwinterb/UIforETW,mwinterb/UIforETW,google/UIforETW,modulexcite/UIforETW,OSVR/UIforETW,OSVR/UIforETW,google/UIforETW,modulexcite/UIforETW,u-engine/UIforETW,mwinterb/UIforETW,MikeMarcin/UIforETW,ariccio/UIforETW,MikeMarcin/UIforETW,MikeMarcin/UIforETW,u-engine/UIforETW,ariccio/UIforETW,google/UIforETW,modulexcite/UIforETW,ariccio/UIforETW,google/UIforETW