Bluetooth: btbcm: Fix NULL deref in btbcm_get_board_name()
In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: btbcm: Fix NULL deref in btbcm_get_board_name()

devm_kstrdup() can return a NULL pointer on failure,but this
returned value in btbcm_get_board_name() is not checked.
Add NULL check in btbcm_get_board_name(), to handle kernel NULL
pointer dereference error.