atm: lanai: set error code when ioremap fails

In function lanai_dev_open(), when the call to ioremap() fails, the
value of return variable result is 0. 0 means no error in this context.
This patch fixes the bug, assigning "-ENOMEM" to result when ioremap()
returns a NULL pointer.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=188791

Signed-off-by: Pan Bian <bianpan2016@163.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/atm/lanai.c

@@ -2143,6 +2143,7 @@ static int lanai_dev_open(struct atm_dev *atmdev)
  lanai->base = (bus_addr_t) ioremap(raw_base, LANAI_MAPPING_SIZE);
  if (lanai->base == NULL) {
  printk(KERN_ERR DEV_LABEL ": couldn't remap I/O space\n");
+ result = -ENOMEM;
  goto error_pci;
  }
  /* 3.3: Reset lanai and PHY */