style: formatting clean up

* data/skeletons/d.m4, examples/d/calc.y, src/output.c,
* src/parse-gram.y:
No tab, no trailing spaces.
Reported by syntax-check.

examples/d/calc.y

@@ -156,4 +156,3 @@ void main ()
   Calc p = new Calc (l);
   p.parse ();
 }
-

src/output.c

@@ -245,7 +245,7 @@ prepare_rules (void)
       /* LHS of the rule R. */
       r1[r] = rules[r].lhs->number;
       /* Length of rule R's RHS. */
-      r2[r] = rule_rhs_length(&rules[r]);
+      r2[r] = rule_rhs_length (&rules[r]);
       /* Dynamic precedence (GLR).  */
       dprec[r] = rules[r].dprec;
       /* Merger-function index (GLR).  */