[#2207] Re-ordered broken null check

STACK Output:
bug: anti-simplify
model: |
  %cmp46 = icmp ne %struct.MsParam* %inpParam2, null, !dbg !1161
  -->  true
stack:
  - /home/kellerb/software/root-stack/irods/iRODS/server/re/src/reDataObjOpr.cpp:3903:0
ncore: 1
core:
  - /home/kellerb/software/root-stack/irods/iRODS/server/re/src/reDataObjOpr.cpp:3903:0
    - null pointer dereference