staging:rtl8723bs: eliminate usage of skb_clone after skb allocation fail

The skb allocated when out of memory
is likely to be discarded during subsequent processing.

Signed-off-by: Ivan Safonov <insafonov@gmail.com>
Link: https://lore.kernel.org/r/20200502151905.43663-1-insafonov@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>