mfd: Allow the board to choose any GPIO base for tps65010

If the board does not care where the TPS turns up, then specifiying the
value -1 to get gpiolib to dynamically allocate the base for the chip
is valid.

Change the test to look for != 0, so that any boards specifying zero
will not end up with gpio that they didn't want.
Signed-off-by: NBen Dooks <ben@simtec.co.uk>
Signed-off-by: NSimtec Liunx Team <linux@simtec.co.uk>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

drivers/mfd/tps65010.c

@@ -637,7 +637,7 @@ static int tps65010_probe(struct i2c_client *client,
 				tps, DEBUG_FOPS);
 
 	/* optionally register GPIOs */
-	if (board && board->base > 0) {
+	if (board && board->base != 0) {
 		tps->outmask = board->outmask;
 
 		tps->chip.label = client->name;