drivers/staging/ath6kl/os/linux/cfg80211.c: Add missing call to cfg80211_put_bss

A call to cfg80211_get_bss hould be accompanied by a call to
cfg80211_put_bss in error-handling code.

A simplified version of the semantic match that finds this problem is:
(http://coccinelle.lip6.fr/)

// <smpl>
@r exists@
local idexpression struct cfg80211_bss * x;
expression ra,rr;
position p1,p2;
@@

x = cfg80211_get_bss@p1(...)
...  when != x = rr
     when != cfg80211_put_bss(x,...)
     when != if (...) { ... cfg80211_put_bss(x,...) ...}
if(...) { ... when != x = ra
     when forall
     when != cfg80211_put_bss(x,...)
 \(return <+...x...+>; \| return@p2...; \) }

@script:python@
p1 << r.p1;
p2 << r.p2;
@@

cocci.print_main("cfg80211_get_bss",p1)
cocci.print_secs("return",p2)

// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>