Input: soc_button_array - fix a crash during rmmod

When the system has zero or one button available, trying to rmmod
soc_button_array will cause crash. Fix this by properly handling -ENODEV
in probe().

Signed-off-by: Lejun Zhu <lejun.zhu@linux.intel.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/misc/soc_button_array.c

@@ -169,6 +169,7 @@ static int soc_button_pnp_probe(struct pnp_dev *pdev,
 				soc_button_remove(pdev);
 				return error;
 			}
+			continue;
 		}
 
 		priv->children[i] = pd;