Fix uninitialised VAX .got and .got.plt section

[Alan Modra]

Cures these failures with MALLOC_PERTURB_=1
FAIL: GOT test (executable)
FAIL: GOT test (shared library)
FAIL: VAX export class call relocation test
FAIL: VAX export class data relocation test

	* elf32-vax.c (elf_vax_size_dynamic_sections): Clear linker
	created sections.

diff --git a/bfd/elf32-vax.c b/bfd/elf32-vax.c
index c28caca..1f41867 100644
--- a/bfd/elf32-vax.c
+++ b/bfd/elf32-vax.c
@@ -1221,7 +1221,7 @@ elf_vax_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
 	continue;
 
       /* Allocate memory for the section contents.  */
-      s->contents = (bfd_byte *) bfd_alloc (dynobj, s->size);
+      s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
       if (s->contents == NULL)
 	return FALSE;
     }

-- 
Alan Modra
Australia Development Lab, IBM