eval: don't try to poke *opflags if opflags is NULL

While changing this code around to not do redundant lookups, dropped
this NULL pointer check. Oops.

Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/asm/eval.c b/asm/eval.c
index c99ee11c..0dd7e61a 100644
--- a/asm/eval.c
+++ b/asm/eval.c
@@ -988,7 +988,8 @@ static expr *expr6(void)
                     label_seg = NO_SEG;
                     label_ofs = 1;
                 } else if (is_extern(ltype)) {
-                    *opflags |= OPFLAG_EXTERN;
+                    if (opflags)
+                        *opflags |= OPFLAG_EXTERN;
                 }
             }
             addtotemp(type, label_ofs);