small fix in sigvec

diff --git a/mach/sun2/libsys/sigvec.c b/mach/sun2/libsys/sigvec.c
index 82a2e69..9b2fb21 100644 (file)
--- a/mach/sun2/libsys/sigvec.c
+++ b/mach/sun2/libsys/sigvec.c
@@ -29,7 +29,7 @@ sigvec(sig,vec,ovec)
                _sigfunc[sig] = old;
                return -1;
        }
-       if (ovec->handler == _sigtramp) {
+       if (ovec && ovec->handler == _sigtramp) {
                ovec->handler = old;
        }
        return 0;