numeric.c: raise TypeError at wrong argument

* numeric.c (int_pos_p, int_neg_p): raise TypeError if not an
  Integer instead of returning nil.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56606 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

numeric.c

@@ -274,7 +274,7 @@ int_pos_p(VALUE num)
     else if (RB_TYPE_P(num, T_BIGNUM)) {
 	return BIGNUM_POSITIVE_P(num);
     }
-    return Qnil;
+    rb_raise(rb_eTypeError, "not an Integer");
 }
 
 static inline int
@@ -286,7 +286,7 @@ int_neg_p(VALUE num)
     else if (RB_TYPE_P(num, T_BIGNUM)) {
 	return BIGNUM_NEGATIVE_P(num);
     }
-    return Qnil;
+    rb_raise(rb_eTypeError, "not an Integer");
 }
 
 static inline int