Check whether the kzalloc() succeeds and return false if it fails.

Fixes: 6423d295 ("driver core: Add sysfs support for physical location of a device")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/YnOn28OFBHHd5bQb@kiliSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>