bug was recently introduced by
commit a5c23283
"BASIC: Store directly SbxVarEntry in SbxArray"

bug was found by clang-tidy

Change-Id: Ibcce6d6024ac60eb143cd873760586a7f6231858
Reviewed-on: https://gerrit.libreoffice.org/23890Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Michael Stahl <mstahl@redhat.com>