staging: vt6655: remove useless return statements

Many return statements in void function were present at the end of
functions, with no effect. They now are removed.

This fixes a bunch of checkpatch warnings.

Signed-off-by: Guillaume Clement <gclement@baobob.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc drivers/staging/vt6655/80211mgr.c
Simple merge

diff --cc drivers/staging/vt6655/baseband.c
Simple merge

diff --cc drivers/staging/vt6655/bssdb.c
Simple merge

diff --cc drivers/staging/vt6655/card.c
Simple merge

diff --cc drivers/staging/vt6655/datarate.c
Simple merge

diff --cc drivers/staging/vt6655/device_main.c
Simple merge

diff --cc drivers/staging/vt6655/hostap.c
Simple merge

diff --cc drivers/staging/vt6655/key.c
Simple merge

diff --cc drivers/staging/vt6655/power.c
Simple merge

diff --cc drivers/staging/vt6655/rxtx.c
Simple merge

diff --cc drivers/staging/vt6655/vntwifi.c
Simple merge

diff --cc drivers/staging/vt6655/wcmd.c
Simple merge

diff --cc drivers/staging/vt6655/wmgr.c
Simple merge