Missing s->op will cause a SIGSEGV when trying to get s->op->type. I encountered the issue when building with sparse in a linux kernel tree containing a vendor network driver. A simple `make` will success but a `make C=2` will exit with exit-code 139. The coredump shows that s->op here is NULL when dealing with a source code line like: u8 *byte; Lines like this exist everywhere. I cannot figure out why just this file breaks sparse. But I think the NULL judge is needed here. Signed-off-by: wenlunpeng <wenlunpeng@uniontech.com> Signed-off-by: Chris Li <sparse@chrisli.org>