string.c: raise a RegexpError

* string.c (get_pat_quoted): simply raise a RegexpError, TypeError
  is never raised.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49696 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

string.c

@@ -4055,7 +4055,7 @@ get_pat_quoted(VALUE pat, int check)
 	pat = val;
     }
     if (check && is_broken_string(pat)) {
-	rb_raise(rb_eTypeError, "%"PRIsVALUE, rb_reg_new_str(pat, 0));
+	rb_exc_raise(rb_reg_check_preprocess(pat));
     }
     return pat;
 }