staging: rtl8723bs: hal: fix error "do not initialise globals to 0"

this patch fixes below Errors reported by checkpatch

ERROR: do not initialise globals to 0
+u8 g_fwdl_chksum_fail = 0;

ERROR: do not initialise globals to 0
+u8 g_fwdl_wintint_rdy_fail = 0;

Signed-off-by: Hariprasad Kelam <hariprasad.kelam@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>