Delete unused variable

[tuzm24]

• To avoid compile warning, delete pbu_count in oapvd_info().

/Users/yearlykim/Applications/CLion.app/Contents/bin/cmake/mac/aarch64/bin/cmake --build /Users/yearlykim/Documents/project/openapv_external/cmake-build-release --target oapv_app_enc -j 12
[13/15] Building C object src/CMakeFiles/oapv.dir/oapv.c.o
/Users/yearlykim/Documents/project/openapv_external/src/oapv.c:2068:9: warning: variable 'pbu_count' set but not used [-Wunused-but-set-variable]
 2068 |     int pbu_count = 0;
      |         ^
1 warning generated.

[kpchoi]

LGTM