[committed][gdb/testsuite] Fix gdb.dwarf2/dw2-unspecified-type-foo.c with -m32

[Tom de Vries]

Hi,

When running test-case gdb.dwarf2/dw2-unspecified-type-foo.c with target board
unix/-m32, I run into:
...
(gdb) PASS: gdb.dwarf2/dw2-unspecified-type.exp: ptype foo
p ((int (*) ()) foo) ()^M
$1 = -135698472^M
...

Add the missing "return 0" in foo, which fixes this.

Tested on x86_64-linux.

Committed to trunk.

Thanks,
- Tom

[gdb/testsuite] Fix gdb.dwarf2/dw2-unspecified-type-foo.c with -m32

---
 gdb/testsuite/gdb.dwarf2/dw2-unspecified-type-foo.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gdb/testsuite/gdb.dwarf2/dw2-unspecified-type-foo.c b/gdb/testsuite/gdb.dwarf2/dw2-unspecified-type-foo.c
index b1e3a8b98e4..c92e18b898f 100644
--- a/gdb/testsuite/gdb.dwarf2/dw2-unspecified-type-foo.c
+++ b/gdb/testsuite/gdb.dwarf2/dw2-unspecified-type-foo.c
@@ -19,4 +19,5 @@ int
 foo (void)
 {
   asm ("foo_label: .globl foo_label");
+  return 0;
 }