staging: vt6655: rxtx.c: Remove unnecessary space after a cast

Issue found by checkpatch.pl semantic patch results for
rxtx.c. Remove unnecessary space after the cast.

CHECK:
No necessary space is required after a cast.

Signed-off-by: Sanjana Sanikommu <sanjana99reddy99@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>