staging: rtl8723bs: core: remove redundant zero'ing of counter variable k

The zero'ing of counter variable k is redundant as it is never read
after breaking out of the while loop. Remove it.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20200223152840.418439-1-colin.king@canonical.com


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