fixup neater code in op.c

Author: leonerd

op.c

@@ -17069,10 +17069,8 @@ S_subsignature_build_defop(pTHX_ struct yy_parser_signature_param *param)
     OP *defexpr_start = LINKLIST(defexpr);
 
     /* Need to build OP_PARAMTEST[ other: OP_PARAMSTORE[ default-expr ] ] */
-    OP *paramstore;
-    OP *paramtest = (OP *)alloc_LOGOP(OP_PARAMTEST,
-        paramstore = newUNOP(OP_PARAMSTORE, 0, defexpr),
-        defexpr_start);
+    OP *paramstore = newUNOP(OP_PARAMSTORE, 0, defexpr);
+    OP *paramtest = (OP *)alloc_LOGOP(OP_PARAMTEST, paramstore, defexpr_start);
 
     paramtest->op_flags |= OPf_WANT_VOID;
     paramtest->op_targ = paramstore->op_targ = param->padix;