dialog: keep route block index as signed int

- otherwise it can be broken value when route block doesn't exit and
kemi callback should be executed
- reported by David Escartin

src/modules/dialog/dlg_hash.h

@@ -114,7 +114,7 @@ typedef struct dlg_cell
 	unsigned int         dflags;		/*!< internal dialog memory flags */
 	unsigned int         iflags;		/*!< internal dialog persistent flags */
 	unsigned int         sflags;		/*!< script dialog persistent flags */
-	unsigned int         toroute;		/*!< index of route that is executed on timeout */
+	int                  toroute;		/*!< index of route that is executed on timeout */
 	str                  toroute_name;	/*!< name of route that is executed on timeout */
 	unsigned int         from_rr_nb;	/*!< information from record routing */
 	struct dlg_tl        tl;			/*!< dialog timer list */

src/modules/dialog/dlg_var.c

@@ -478,8 +478,8 @@ int pv_get_dlg_ctx(struct sip_msg *msg,  pv_param_t *param,
 			return pv_get_uintval(msg, param, res,
 					(unsigned int)_dlg_ctx.dir);
 		case 7:
-			return pv_get_uintval(msg, param, res,
-					(unsigned int)_dlg_ctx.to_route);
+			return pv_get_sintval(msg, param, res,
+					_dlg_ctx.to_route);
 		default:
 			return pv_get_uintval(msg, param, res,
 					(unsigned int)_dlg_ctx.on);
@@ -601,6 +601,7 @@ int pv_get_dlg(struct sip_msg *msg, pv_param_t *param,
 	int res_type = 0;
 	str sv = { 0 };
 	unsigned int ui = 0;
+	int si = 0;
 
 	if(param==NULL)
 		return -1;
@@ -683,8 +684,8 @@ int pv_get_dlg(struct sip_msg *msg, pv_param_t *param,
 			sv.s[sv.len] = '\0';
 			break;
 		case 9:
-			res_type = 1;
-			ui = (unsigned int)dlg->toroute;
+			res_type = 3;
+			si = dlg->toroute;
 			break;
 		case 10:
 			if(dlg->cseq[DLG_CALLEE_LEG].s==NULL
@@ -817,6 +818,8 @@ done:
 			return pv_get_uintval(msg, param, res, ui);
 		case 2:
 			return pv_get_strval(msg, param, res, &sv);
+		case 3:
+			return pv_get_sintval(msg, param, res, si);
 		default:
 			return pv_get_null(msg, param, res);
 	}