[OB PATCH] Fix gdb.threads/tls-so_extern.exp with Clang

[Gary Benson]

Hi all,

Clang fails to compile gdb.threads/tls-so_extern_main.c, giving the
following error:

  /gdbtest/src/gdb/testsuite/gdb.threads/tls-so_extern_main.c:28:1:
    warning: non-void function does not return a value [-Wreturn-type]

This commit adds a return statement to the offending function.

Checked on Fedora 32 x86_64, with GCC and Clang, and pushed as obvious.

Thanks,
Gary

---
gdb/testsuite/ChangeLog:

	* gdb.threads/tls-so_extern_main.c (tls_ptr): Add missing return
	statement.
---
 gdb/testsuite/ChangeLog                        | 5 +++++
 gdb/testsuite/gdb.threads/tls-so_extern_main.c | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/gdb/testsuite/gdb.threads/tls-so_extern_main.c b/gdb/testsuite/gdb.threads/tls-so_extern_main.c
index c326451..8ad857c 100644
--- a/gdb/testsuite/gdb.threads/tls-so_extern_main.c
+++ b/gdb/testsuite/gdb.threads/tls-so_extern_main.c
@@ -25,6 +25,8 @@
 {
    so_extern = &so_extern;
    so_extern2 = &so_extern2; /* break here to check result */
+
+   return NULL;
 }
 
 int
-- 
1.8.3.1