BOOST_ASSERT() in gzip.hpp triggers clang warning -Wstring-conversion

boost/iostreams/filter/gzip.hpp, line 551:
`BOOST_ASSERT(!"Bad state");`

This line triggers a -Wstring-conversion warning:

> boost/iostreams/filter/gzip.hpp:551:31: warning: implicit conversion turns string literal into bool: 'const char[10]' to 'bool' [-Wstring-conversion]

Would it be possible to use `BOOST_ASSERT_MSG(false,"Bad state");` instead?

This would make it easier to enable the warning in projects that use Boost.IOStreams.

Btw: Most Boost code uses `BOOST_ASSERT_MSG()` nowadays (240 hits), the use of `BOOST_ASSERT(!...)` is not widespread (only 9 hits).

Open boost/iostreams/filter/gzip.hpp at line 551 and compare the nearby assertion with the project’s BOOST_ASSERT_MSG usage. Done means the gzip header no longer triggers clang’s -Wstring-conversion warning while preserving the existing bad-state assertion behavior.

Written by the indexing model from the issue text.