Staging: rt2870: rtusb_io.c: Checkpatch cleanup

drivers/staging/rt2870/common/rtusb_io.c:27: ERROR: code indent should use tabs where possible
drivers/staging/rt2870/common/rtusb_io.c:404: ERROR: while should follow close brace '}'
drivers/staging/rt2870/common/rtusb_io.c:459: ERROR: while should follow close brace '}'
drivers/staging/rt2870/common/rtusb_io.c:655: ERROR: return is not a function, parentheses are not required
drivers/staging/rt2870/common/rtusb_io.c:659: ERROR: return is not a function, parentheses are not required
drivers/staging/rt2870/common/rtusb_io.c:669: ERROR: return is not a function, parentheses are not required
drivers/staging/rt2870/common/rtusb_io.c:701: ERROR: return is not a function, parentheses are not required
drivers/staging/rt2870/common/rtusb_io.c:729: ERROR: return is not a function, parentheses are not required
drivers/staging/rt2870/common/rtusb_io.c:739: ERROR: return is not a function, parentheses are not required
drivers/staging/rt2870/common/rtusb_io.c:770: ERROR: return is not a function, parentheses are not required
drivers/staging/rt2870/common/rtusb_io.c:1412: ERROR: that open brace { should be on the previous line
drivers/staging/rt2870/common/rtusb_io.c:1434: ERROR: that open brace { should be on the previous line

Signed-off-by: Andrea Gelmini <andrea.gelmini@gelma.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>