More finetuning of output filtering.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@7591 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/exp-drd/tests/tc09_bad_unlock.stderr.exp b/exp-drd/tests/tc09_bad_unlock.stderr.exp
index 052df38..ef78d36 100644
--- a/exp-drd/tests/tc09_bad_unlock.stderr.exp
+++ b/exp-drd/tests/tc09_bad_unlock.stderr.exp
@@ -9,7 +9,7 @@
    at 0x........: pthread_mutex_unlock (drd_intercepts.c:?)
    by 0x........: child_fn (tc09_bad_unlock.c:11)
    by 0x........: vg_thread_wrapper (drd_intercepts.c:?)
-   by 0x........: start_thread (in libpthread-?.?.so)
+   by 0x........: (within libpthread-?.?.so)
    by 0x........: clone (in /...libc...)
 
 Thread 1:
@@ -32,7 +32,7 @@
    at 0x........: pthread_mutex_unlock (drd_intercepts.c:?)
    by 0x........: child_fn (tc09_bad_unlock.c:11)
    by 0x........: vg_thread_wrapper (drd_intercepts.c:?)
-   by 0x........: start_thread (in libpthread-?.?.so)
+   by 0x........: (within libpthread-?.?.so)
    by 0x........: clone (in /...libc...)
 
 Thread 1: