Remove unnecessary conditions as suggested by clang-tidy. NFC

Patch by: Gergely Angeli!

Differential Revision: https://reviews.llvm.org/D31936

llvm-svn: 301807
diff --git a/llvm/lib/Target/TargetLoweringObjectFile.cpp b/llvm/lib/Target/TargetLoweringObjectFile.cpp
index 50272fd..91cc97e 100644
--- a/llvm/lib/Target/TargetLoweringObjectFile.cpp
+++ b/llvm/lib/Target/TargetLoweringObjectFile.cpp
@@ -44,7 +44,7 @@
                                           const TargetMachine &TM) {
   Ctx = &ctx;
   // `Initialize` can be called more than once.
-  if (Mang != nullptr) delete Mang;
+  delete Mang;
   Mang = new Mangler();
   InitMCObjectFileInfo(TM.getTargetTriple(), TM.isPositionIndependent(),
                        TM.getCodeModel(), *Ctx);