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94cdc6a2c8
mmap() is documented to return MAP_FAILED on error, but tcp_mmap.c compares the return value against (void *)-1 and (unsigned char *)-1. Replace these with the standard MAP_FAILED macro for better readability and type safety. Signed-off-by: longlong yan <yanlonglong@kylinos.cn> Reviewed-by: Joe Damato <joe@dama.to> Reviewed-by: Eric Dumazet <edumazet@google.com> Link: https://patch.msgid.link/20260722015129.916-1-yanlonglong@kylinos.cn Signed-off-by: Jakub Kicinski <kuba@kernel.org>