<sys/thread_properties.h>: remove stray semicolon in the implementation.

Test: treehugger
Change-Id: I5f9d9d5b45ca74de2eb837c881582a6a87fdf0f6
diff --git a/libc/bionic/sys_thread_properties.cpp b/libc/bionic/sys_thread_properties.cpp
index d7188f5..064bca1 100644
--- a/libc/bionic/sys_thread_properties.cpp
+++ b/libc/bionic/sys_thread_properties.cpp
@@ -61,7 +61,7 @@
   if (modules.first_thread_exit_callback == nullptr) {
     modules.first_thread_exit_callback = cb;
     return;
-  };
+  }
 
   BionicAllocator& allocator = __libc_shared_globals()->tls_allocator;
   CallbackHolder* new_node =