[C++] Use 'nullptr'. Target edition.

llvm-svn: 207197
diff --git a/llvm/lib/Target/NVPTX/NVPTXInstrInfo.cpp b/llvm/lib/Target/NVPTX/NVPTXInstrInfo.cpp
index 6808f0e..cdc8088 100644
--- a/llvm/lib/Target/NVPTX/NVPTXInstrInfo.cpp
+++ b/llvm/lib/Target/NVPTX/NVPTXInstrInfo.cpp
@@ -257,7 +257,7 @@
          "NVPTX branch conditions have two components!");
 
   // One-way branch.
-  if (FBB == 0) {
+  if (!FBB) {
     if (Cond.empty()) // Unconditional branch
       BuildMI(&MBB, DL, get(NVPTX::GOTO)).addMBB(TBB);
     else // Conditional branch