errno bug in ngx_unix_recv().

src/os/unix/ngx_recv.c in function: ssize_t ngx_unix_recv(ngx_connection_t *c, u_char *buf, size_t size) err = ngx_socket_errno; should before ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,"recv: fd:%d %d of %d", c->fd, n, size); because ngx_log_debug3 may change errno, for example change errno

errno bug in ngx_unix_recv().

src/os/unix/ngx_recv.c in function: ssize_t ngx_unix_recv(ngx_connection_t *c, u_char *buf, size_t size) err = ngx_socket_errno; should before ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,"recv: fd:%d %d of %d", c->fd, n, size); because ngx_log_debug3 may change errno, for example change er