[RFA] Fix build failure on AiX...

[Joel Brobecker <brobecker@gnat.com>]

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This is a following on the following change:

    http://sources.redhat.com/ml/gdb-patches/2004-03/msg00000.html

GDB fails to build on AiX because we're trying to dereference an
opaque structure (struct frame_info).

I suggest the following patch to fix the build failure:

        * rs6000-tdep.c (rs6000_init_frame_pc_first): Fix compilation failure.

OK to apply? (it may appear obvious to the usual maintainers, but the
frame stuff still makes me nervous sometimes, especially the easy
confusion with next, prev, inner most, etc...)

-- 
Joel

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Index: rs6000-tdep.c
===================================================================
RCS file: /cvs/src/src/gdb/rs6000-tdep.c,v
retrieving revision 1.182
diff -u -p -r1.182 rs6000-tdep.c
--- rs6000-tdep.c	1 Mar 2004 00:50:56 -0000	1.182
+++ rs6000-tdep.c	1 Mar 2004 20:02:05 -0000
@@ -213,8 +213,10 @@ rs6000_frame_init_saved_regs (struct fra
 static CORE_ADDR
 rs6000_init_frame_pc_first (int fromleaf, struct frame_info *prev)
 {
-  return (fromleaf ? DEPRECATED_SAVED_PC_AFTER_CALL (prev->next)
-	  : prev->next ? DEPRECATED_FRAME_SAVED_PC (prev->next) : read_pc ());
+  struct frame_info* next = get_next_frame (prev);
+
+  return (fromleaf ? DEPRECATED_SAVED_PC_AFTER_CALL (next)
+	  : next ? DEPRECATED_FRAME_SAVED_PC (next) : read_pc ());
 }
 
 static CORE_ADDR