[sanitizer] Fix the return type for GetTid in Fuchsia implementation
This is triggering "functions that differ only in their return type
cannot be overloaded" error.
@@ -66,7 +66,7 @@ uptr internal_getpid() {
uptr GetThreadSelf() { return reinterpret_cast<uptr>(thrd_current()); }
-uptr GetTid() { return GetThreadSelf(); }
+tid_t GetTid() { return GetThreadSelf(); }
void Abort() { abort(); }
