Simplify adb_thread_create.

Change-Id: I36d6021ef8fbc23e8bcd4ddbe1dac0eba467cc70
diff --git a/services.cpp b/services.cpp
index 7e47729..e53a28c 100644
--- a/services.cpp
+++ b/services.cpp
@@ -210,8 +210,7 @@
     sti->cookie = cookie;
     sti->fd = s[1];
 
-    adb_thread_t t;
-    if (adb_thread_create(&t, service_bootstrap_func, sti)) {
+    if (!adb_thread_create(service_bootstrap_func, sti)) {
         free(sti);
         adb_close(s[0]);
         adb_close(s[1]);
@@ -401,8 +400,7 @@
     sti->cookie = (void*) (uintptr_t) pid;
     sti->fd = ret_fd;
 
-    adb_thread_t t;
-    if (adb_thread_create(&t, service_bootstrap_func, sti)) {
+    if (!adb_thread_create(service_bootstrap_func, sti)) {
         free(sti);
         adb_close(ret_fd);
         fprintf(stderr, "cannot create service thread\n");