Minor rework of code example for clarity. No functionality change

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@161776 91177308-0d34-0410-b5e6-96231b3b80d8

docs/LibTooling.html

@@ -141,13 +141,11 @@ int main(int argc, const char **argv) {
   cl::ParseCommandLineOptions(argc, argv);
   if (!Compilations) {
     std::string ErrorMessage;
-    if (!BuildPath.empty()) {
-      Compilations.reset(
-         CompilationDatabase::autoDetectFromDirectory(BuildPath, ErrorMessage));
-    } else {
-      Compilations.reset(CompilationDatabase::autoDetectFromSource(
-          SourcePaths[0], ErrorMessage));
-    }
+    Compilations.reset(
+      !BuildPath.empty() ?
+        CompilationDatabase::autoDetectFromDirectory(BuildPath, ErrorMessage) :
+        CompilationDatabase::autoDetectFromSource(SourcePaths[0], ErrorMessage)
+      );
     if (!Compilations)
       llvm::report_fatal_error(ErrorMessage);
   }