[libc++] Fix copy-paste mistake in __threading_support

[ldionne]

Do you need help committing this?

[ColinFinck]

I don't have LLVM commit access, so I guess I do need help committing this.

[ldionne]

Can you please provide Full Name <email@domain> so I can properly attribute the contribution?

[ColinFinck]

Colin Finck <[e-mail]>

Thanks a lot!

libcxx/include/__threading_support

int __libcpp_recursive_mutex_lock(__libcpp_recursive_mutex_t *__m)
   return pthread_mutex_lock(__m);
 }
 
 bool __libcpp_recursive_mutex_trylock(__libcpp_recursive_mutex_t *__m)
 {
   return pthread_mutex_trylock(__m) == 0;
 }
 
-int __libcpp_recursive_mutex_unlock(__libcpp_mutex_t *__m)
+int __libcpp_recursive_mutex_unlock(__libcpp_recursive_mutex_t *__m)
 {
   return pthread_mutex_unlock(__m);
 }
 
 int __libcpp_recursive_mutex_destroy(__libcpp_recursive_mutex_t *__m)
 {
   return pthread_mutex_destroy(__m);
 }
int __libcpp_recursive_mutex_lock(__libcpp_recursive_mutex_t *__m)
   return mtx_lock(__m) == thrd_success ? 0 : EINVAL;
 }
 
 bool __libcpp_recursive_mutex_trylock(__libcpp_recursive_mutex_t *__m)
 {
   return mtx_trylock(__m) == thrd_success;
 }
 
-int __libcpp_recursive_mutex_unlock(__libcpp_mutex_t *__m)
+int __libcpp_recursive_mutex_unlock(__libcpp_recursive_mutex_t *__m)
 {
   return mtx_unlock(__m) == thrd_success ? 0 : EINVAL;
 }
 
 int __libcpp_recursive_mutex_destroy(__libcpp_recursive_mutex_t *__m)
 {
   mtx_destroy(__m);
   return 0;