patch to robustify gnuv3_rtti_type

[Per Bothner <per@bothner.com>]

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Ok to check in?  This doesn't fix the real problem, which is that
gcj produces vtables that aren't properly abi-compliant.  Hopefully,
we'll fix that.  But for now, let's at least prevent gdb from crashing.

	* gnu-v3-abi.c (gnuv3_rtti_type):  Guard that vtable_symbol_name
	isn't NULL, which can happen with some gcj3.0-produced code.
-- 
	--Per Bothner
per@bothner.com   http://www.bothner.com/per/

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Index: gnu-v3-abi.c
===================================================================
RCS file: /cvs/src/src/gdb/gnu-v3-abi.c,v
retrieving revision 1.6
diff -u -r1.6 gnu-v3-abi.c
--- gnu-v3-abi.c	2002/01/04 18:20:19	1.6
+++ gnu-v3-abi.c	2002/01/19 20:33:49
@@ -239,7 +239,8 @@
      type_info object itself to get the class name.  But this way
      should work just as well, and doesn't read target memory.  */
   vtable_symbol_name = SYMBOL_DEMANGLED_NAME (vtable_symbol);
-  if (strncmp (vtable_symbol_name, "vtable for ", 11))
+  if (vtable_symbol_name == NULL
+      || strncmp (vtable_symbol_name, "vtable for ", 11))
     error ("can't find linker symbol for virtual table for `%s' value",
            TYPE_NAME (value_type));
   class_name = vtable_symbol_name + 11;