staging: sm750fb: disable PCI device if lynxfb_pci_probe fails

In case of error during lynxfb_pci_probe, the function returned without
calling pci_disable_device. Fix it by adding pci_disable_device on the
error cleanup path.

Signed-off-by: Mike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/sm750fb/sm750.c b/drivers/staging/sm750fb/sm750.c
index c78421b..c80b11c 100644
--- a/drivers/staging/sm750fb/sm750.c
+++ b/drivers/staging/sm750fb/sm750.c
@@ -1132,6 +1132,7 @@
 err_map:
 	kfree(sm750_dev);
 err_share:
+	pci_disable_device(pdev);
 err_enable:
 	return -ENODEV;
 }