[SYCL][NFC] Fix unreferenced variable warning (#1158)

Also remove idle semicolon.

Signed-off-by: Alexey Bader <[email protected]>

Author: bader

sycl/source/detail/os_util.cpp

@@ -205,13 +205,14 @@ std::string OSUtil::getCurrentDSODir() {
     sizeof(Path));
   assert(Ret < sizeof(Path) && "Path is longer than PATH_MAX?");
   assert(Ret > 0 && "GetModuleFileNameA failed");
+  (void)Ret;
 
   BOOL RetCode = PathRemoveFileSpecA(reinterpret_cast<LPSTR>(&Path));
   assert(RetCode && "PathRemoveFileSpecA failed");
   (void)RetCode;
 
   return Path;
-};
+}
 
 #elif defined(SYCL_RT_OS_DARWIN)
 OSModuleHandle OSUtil::getOSModuleHandle(const void *VirtAddr) {