fix missing initialization in Xtensa port of BFD

fix missing initialization in Xtensa port of BFD

[Bob Wilson]

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I noticed today that addr2line crashed when I ran it on an unrelocated Xtensa 
object file.  The Xtensa ISA information was not being initialized.  I've 
committed this patch on the mainline to fix it.

2005-05-20  Bob Wilson  <bob.wilson@acm.org>

	* elf32-xtensa.c (bfd_elf_xtensa_reloc): Make sure that
	xtensa_default_isa is initialized.


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Index: elf32-xtensa.c
===================================================================
RCS file: /cvs/src/src/bfd/elf32-xtensa.c,v
retrieving revision 1.48
diff -u -p -r1.48 elf32-xtensa.c
--- elf32-xtensa.c	14 May 2005 00:26:06 -0000	1.48
+++ elf32-xtensa.c	20 May 2005 19:48:14 -0000
@@ -1855,6 +1855,9 @@ bfd_elf_xtensa_reloc (bfd *abfd,
   asection *reloc_target_output_section;
   bfd_boolean is_weak_undef;
 
+  if (!xtensa_default_isa)
+    xtensa_default_isa = xtensa_isa_init (0, 0);
+
   /* ELF relocs are against symbols.  If we are producing relocatable
      output, and the reloc is against an external symbol, the resulting
      reloc will also be against the same symbol.  In such a case, we