Dear all,

I've committed an obvious patch for NULL pointer dereferences
that could occur when checking EQUIVALENCEs.  See also attached.

Testcase by Gerhard.

Regtested on x86_64-pc-linux-gnu.

Pushed: https://gcc.gnu.org/g:e505f7493bed1395d121d2f53137ec11706fa42e

Thanks,
Harald