smc91xx_eeprom: Correct chip detection check.

The smc911x_detect function in /net/driver/net/smc911x.c
returns a 0 if everything was ok (a chip was found) and -1 else.
In the standalone example 'smc911x_eeprom' the return value
of smc911x_detect is interpreted in a different way
(0 for error, !0 as OK).
This leads to the error that the chip will not be detected.

Signed-off-by: Juergen Kilb <j.kilb@phytec.de>
Acked-by: Mike Frysinger <vapier@gentoo.org>

Signed-off-by: Ben Warren <biggerbadderben@gmail.com>

examples/standalone/smc911x_eeprom.c

@@ -240,7 +240,7 @@ static void dump_eeprom(struct eth_device *dev)
 static int smc911x_init(struct eth_device *dev)
 {
 	/* See if there is anything there */
-	if (!smc911x_detect_chip(dev))
+	if (smc911x_detect_chip(dev))
 		return 1;
 
 	smc911x_reset(dev);