(decrement_and_branch_until_zero): Add missing `return'.

From-SVN: r6018

gcc/config/pa/pa.md

@@ -3078,7 +3078,7 @@
 	(plus:SI (match_dup 0) (match_dup 1)))
    (clobber (match_scratch:SI 4 "=X,r,r"))]
   ""
-"* output_dbra (operands, insn, which_alternative); "
+  "* return output_dbra (operands, insn, which_alternative); "
 ;; Do not expect to understand this the first time through.  
 [(set_attr "type" "cbranch,multi,multi")
  (set (attr "length")