Squash the warning that `Result' may not be initialized on all code paths.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8042 91177308-0d34-0410-b5e6-96231b3b80d8

tools/bugpoint/BugDriver.cpp

@@ -161,7 +161,7 @@ bool BugDriver::run() {
   if (DebugMode == DebugCompile) {
     std::cout << "\n*** Debugging miscompilation!\n";
     Result = debugMiscompilation();
-  } else if (DebugMode == DebugCodegen) {
+  } else { // there is only one other possible value: DebugCodegen
     std::cout << "Debugging code generator problem!\n";
     Result = debugCodeGenerator();
   }