remove leftover comment

Author: gerard-ziemski

src/hotspot/os/posix/signals_posix.hpp

@@ -47,7 +47,6 @@ class PosixSignals : public AllStatic {
 
   static bool is_sig_ignored(int sig);
 
-  // unblocks the signal masks for current thread
   static void hotspot_sigmask(Thread* thread);
 
   static void print_signal_handler(outputStream* st, int sig, char* buf, size_t buflen);