[#2207] Removed unnecessary null check

STACK Output:
bug: anti-dce
model: |
  %tobool131 = icmp ne %"class.irods::network"* %86, null, !dbg !4495
  -->  true
  ************************************************************
  if.then132:
  %call133 = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([42 x i8]* @.str68, i32 0, i32 0)), !dbg !4497
  br label %if.end134, !dbg !4499
stack:
  - /home/kellerb/software/root-stack/irods/plugins/network/ssl/libssl.cpp:1299:0
ncore: 1
core:
  - /home/kellerb/software/root-stack/irods/plugins/network/ssl/libssl.cpp:1295:0
    - null pointer dereference