rl78.c: fix warning

gcc/ChangeLog:
	* config/rl78/rl78.c (rl78_expand_prologue): Convert local
	from int to unsigned.

From-SVN: r237017

gcc/ChangeLog

+2016-06-01  David Malcolm  <dmalcolm@redhat.com>
+
+	* config/rl78/rl78.c (rl78_expand_prologue): Convert local
+	from int to unsigned.
+
 2016-05-31  Michael Meissner  <meissner@linux.vnet.ibm.com>
 
 	* config/rs6000/vsx.md (vsx_splat_<mode>, V2DI/V2DF): Simplify

gcc/config/rl78/rl78.c

@@ -1378,7 +1378,7 @@ rl78_expand_prologue (void)
   /* Save MDUC registers inside interrupt routine.  */
   if (MUST_SAVE_MDUC_REGISTERS && (!crtl->is_leaf || check_mduc_usage ()))
     {
-      for (int i = 0; i < ARRAY_SIZE (mduc_regs); i++)
+      for (unsigned i = 0; i < ARRAY_SIZE (mduc_regs); i++)
         {
           mduc_reg_type *reg = mduc_regs + i;
           rtx mem_mduc = gen_rtx_MEM (reg->mode, GEN_INT (reg->address));