[SYCL][NFC] Fix string comparison in handler.hpp (#1761)

It is not correct to compare c strings content using == operator.

Author: romanovvlad

sycl/include/CL/sycl/handler.hpp

@@ -411,7 +411,7 @@ class __SYCL_EXPORT handler {
     using KI = sycl::detail::KernelInfo<KernelName>;
     // Empty name indicates that the compilation happens without integration
     // header, so don't perform things that require it.
-    if (KI::getName() != "") {
+    if (KI::getName() != nullptr && KI::getName()[0] != '\0') {
       MArgs.clear();
       extractArgsAndReqsFromLambda(MHostKernel->getPtr(), KI::getNumParams(),
                                    &KI::getParamDesc(0));