Report correct errno on clone failure

Test: make
Change-Id: Id0af3678627c06167a6d434d8616c4a304e1fbc0
diff --git a/libc/bionic/pthread_create.cpp b/libc/bionic/pthread_create.cpp
index 9197aa3..9be86f1 100644
--- a/libc/bionic/pthread_create.cpp
+++ b/libc/bionic/pthread_create.cpp
@@ -278,7 +278,7 @@
       munmap(thread->attr.stack_base, thread->mmap_size);
     }
     async_safe_format_log(ANDROID_LOG_WARN, "libc", "pthread_create failed: clone failed: %s",
-                          strerror(errno));
+                          strerror(clone_errno));
     return clone_errno;
   }