[obv] change a few more TREE_CHAINs to DECL_CHAINs

[Nathan Froyd]

I went back and reviewed all the TREE_CHAINs my scripts had converted
into DECL_CHAINs and then back again and discovered a few below that
shouldn't have gotten converted back.  I must have been debugging my
scripts or something similar.  I think these qualify as obvious.

Tested with bootstrap on x86_64-unknown-linux-gnu, tested with cross to
arm-eabi, mips-elf, and powerpc-eabispe.  Committed.

-Nathan

	* c-decl.c (detect_field_duplicates): Use DECL_CHAIN insted of
	TREE_CHAIN.
	* c-typeck.c (push_init_level): Likewise.
	(process_init_element): Likewise.

Index: c-decl.c
===================================================================
--- c-decl.c	(revision 162238)
+++ c-decl.c	(working copy)
@@ -6705,8 +6705,7 @@ detect_field_duplicates (tree fieldlist)
      the nested traversal thing.  */
   if (timeout > 0)
     {
-      for (x = TREE_CHAIN (fieldlist); x ;
-	   x = TREE_CHAIN (x))
+      for (x = DECL_CHAIN (fieldlist); x; x = DECL_CHAIN (x))
 	if (DECL_NAME (x))
 	  {
 	    for (y = fieldlist; y != x; y = TREE_CHAIN (y))
Index: c-typeck.c
===================================================================
--- c-typeck.c	(revision 162238)
+++ c-typeck.c	(working copy)
@@ -6683,7 +6683,7 @@ push_init_level (int implicit, struct ob
       /* Skip any nameless bit fields at the beginning.  */
       while (constructor_fields != 0 && DECL_C_BIT_FIELD (constructor_fields)
 	     && DECL_NAME (constructor_fields) == 0)
-	constructor_fields = TREE_CHAIN (constructor_fields);
+	constructor_fields = DECL_CHAIN (constructor_fields);
 
       constructor_unfilled_fields = constructor_fields;
       constructor_bit_index = bitsize_zero_node;
@@ -8014,7 +8014,7 @@ process_init_element (struct c_expr valu
 	  if (fieldcode == ARRAY_TYPE
 	      && !require_constant_value
 	      && TYPE_SIZE (fieldtype) == NULL_TREE
-	      && TREE_CHAIN (constructor_fields) == NULL_TREE)
+	      && DECL_CHAIN (constructor_fields) == NULL_TREE)
 	    {
 	      error_init ("non-static initialization of a flexible array member");
 	      break;
@@ -8144,7 +8144,7 @@ process_init_element (struct c_expr valu
 	       directly output as a constructor.  */
 	    {
 	      constructor_bit_index = DECL_SIZE (constructor_fields);
-	      constructor_unfilled_fields = TREE_CHAIN (constructor_fields);
+	      constructor_unfilled_fields = DECL_CHAIN (constructor_fields);
 	    }
 
 	  constructor_fields = 0;