Revert non-functional pthread_detach() change

Author: kleisauke

system/lib/libc/musl/src/thread/pthread_detach.c

@@ -4,9 +4,10 @@
 static int __pthread_detach(pthread_t t)
 {
 #ifdef __EMSCRIPTEN__
-	// XXX Emscripten: Add check for invalid (already joined) thread.  Again
+	// XXX EMSCRIPTEN: Add check for invalid (already joined) thread.  Again
 	// for the benefit of the conformance tests.
-	if (!_emscripten_thread_is_valid(t)) return ESRCH;
+	if (!_emscripten_thread_is_valid(t))
+		return ESRCH;
 #endif
 	/* If the cas fails, detach state is either already-detached
 	 * or exiting/exited, and pthread_join will trap or cleanup. */