[sanitizer] Fix memory leak in sanitizer_common discovered by LeakSanitizer.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@185536 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/sanitizer_common/sanitizer_linux_libcdep.cc b/lib/sanitizer_common/sanitizer_linux_libcdep.cc
index 239df35..a00a8e2 100644
--- a/lib/sanitizer_common/sanitizer_linux_libcdep.cc
+++ b/lib/sanitizer_common/sanitizer_linux_libcdep.cc
@@ -63,6 +63,7 @@
     return;
   }
   pthread_attr_t attr;
+  pthread_attr_init(&attr);
   CHECK_EQ(pthread_getattr_np(pthread_self(), &attr), 0);
   uptr stacksize = 0;
   void *stackaddr = 0;