x32/Time: Fix potential null pointer dereference in clock_nanosleep

Prevents a potential null dereference in our code that could result from
user code.

Source/Tests/LinuxSyscalls/x32/Time.cpp

@@ -72,16 +72,22 @@ namespace FEX::HLE::x32 {
     });
 
     REGISTER_SYSCALL_IMPL_X32(clock_nanosleep, [](FEXCore::Core::CpuStateFrame *Frame, clockid_t clockid, int flags, const timespec32 *request, timespec32 *remain) -> uint64_t {
-      struct timespec req64{};
       struct timespec rem64{};
       struct timespec *rem64_ptr{};
 
-      req64 = *request;
       if (remain) {
         rem64 = *remain;
         rem64_ptr = &rem64;
       }
-      uint64_t Result = ::clock_nanosleep(clockid, flags, &req64, rem64_ptr);
+
+      uint64_t Result = 0;
+      if (request) {
+        const struct timespec req64 = *request;
+        Result = ::clock_nanosleep(clockid, flags, &req64, rem64_ptr);
+      } else {
+        Result = ::clock_nanosleep(clockid, flags, nullptr, rem64_ptr);
+      }
+
       if (remain) {
         *remain = rem64;
       }