Unreachable statements in clock/clock.h#31

From building `munit-plus` on Travis CI (built with C++ 2011 on PGI C++ compiler): ``` pgc++ --c++11 -mp -o example munit.cpp example.cpp munit.cpp: "munit.cpp", line 596: warning: statement is unreachable return 0; ^ "munit.cpp", line 654: warning: statement is unreachable return 0; ^ "munit.cpp", line 714: warning: statement is unreachable return 0; ^ ``` The relevant lines on this repository seem to be in `clock/clock.h` (commit 58347989ac65490b9dcdb13804e28e2f910f2adc): - [line 298](https://github.com/nemequ/portable-snippets/blob/26496acb37ab46ee249ea19d45381da6955d89c4/clock/clock.h#L298) in `psnip_clock_wall_get_time` - [line 356](https://github.com/nemequ/portable-snippets/blob/26496acb37ab46ee249ea19d45381da6955d89c4/clock/clock.h#L356) in `psnip_clock_cpu_get_time` - [line 416](https://github.com/nemequ/portable-snippets/blob/26496acb37ab46ee249ea19d45381da6955d89c4/clock/clock.h#L416) in `psnip_clock_monotonic_get_time` Feel free to label as `wontfix`. Here is a link to the relevant build job on Travis CI: [https://travis-ci.com/github/codylico/munit-plus/jobs/300147973](https://travis-ci.com/github/codylico/munit-plus/jobs/300147973) Here is a link to the GitHub repository for the project: [https://github.com/codylico/munit-plus](https://github.com/codylico/munit-plus)