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[ Upstream commit bc4c0a48bdad7f225740b8e750fdc1da6d85e1eb ] The get_next_frame() function in psock_tpacket.c was missing a return statement in its default switch case, leading to a compiler warning. This was caused by a `bug_on(1)` call, which is defined as an `assert()`, being compiled out because NDEBUG is defined during the build. Instead of adding a `return NULL;` which would silently hide the error and could lead to crashes later, this change restores the original author's intent. By adding `#undef NDEBUG` before including <assert.h>, we ensure the assertion is active and will cause the test to abort if this unreachable code is ever executed. Signed-off-by: Wake Liu <wakel@google.com> Link: https://patch.msgid.link/20250809062013.2407822-1-wakel@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>