message: Updating api to fix clang warnings
diff: @@ -161,15 +161,16 @@ std::shared_ptr<Accelerator> getAccelerator() {
  error("Invalid use of XACC API. getAccelerator() with no string argument "
  "requires that you set --accelerator at the command line.");
  }
  +
  auto acc = ServiceRegistry::instance()->getService<Accelerator>(getOption("accelerator"));
  if (acc) {
  acc->initialize();
  - return acc;
  } else {
  error(
  "Invalid Accelerator. Could not find " + getOption("accelerator")
  + " in Accelerator Registry.");
  }
  + return acc;
  }
  std::shared_ptr<Accelerator> getAccelerator(const std::string& name) {
  @@ -181,12 +182,12 @@ std::shared_ptr<Accelerator> getAccelerator(const std::string& name) {
  auto acc = ServiceRegistry::instance()->getService<Accelerator>(name);
  if (acc) {
  acc->initialize();
  - return acc;
  } else {
  error(
  "Invalid Accelerator. Could not find " + name
  + " in Accelerator Registry.");
  }
  + return acc;
  }
  bool hasAccelerator(const std::string& name) {
  @@ -206,13 +207,12 @@ std::shared_ptr<Compiler> getCompiler(const std::string& name) {
  "xacc::Initialize() before using API.");
  }
  auto c = ServiceRegistry::instance()->getService<Compiler>(name);
  - if (c) {
  - return c;
  - } else {
  + if (!c) {
  error(
  "Invalid Compiler. Could not find " + name
  + " in Service Registry.");
  }
  + return c;
  }
  std::shared_ptr<Compiler> getCompiler() {
  @@ -227,13 +227,12 @@ std::shared_ptr<Compiler> getCompiler() {
  "requires that you set --compiler at the command line.");
  }
  auto compiler = ServiceRegistry::instance()->getService<Compiler>(getOption("compiler"));
  - if (compiler) {
  - return compiler;
  - } else {
  + if (!compiler) {
  error(
  "Invalid Compiler. Could not find " + (*options)["compiler"]
  + " in Compiler Registry.");
  }
  + return compiler;
  }
  bool hasCompiler(const std::string& name) {
  @@ -248,14 +247,13 @@ std::shared_ptr<IRTransformation> getIRTransformations(
  "xacc::Initialize() before using API.");
  }
  auto t = ServiceRegistry::instance()->getService<IRTransformation>(name);
  - if (t) {
  - return t;
  - } else {
  + if (!t) {
  error(
  "Invalid IRTransformation. Could not find " + name
  + " in Service Registry.");
  }
  + return t;
  }
  const std::string translate(const std::string& original, const std::string& originalLanguageName,
  