Staging: iio: fix a MAINTAINERS entry

The "drivers/" part of the path name was missing.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

MAINTAINERS

@@ -776,7 +776,7 @@ S:	Supported
 F:	drivers/iio/*/ad*
 X:	drivers/iio/*/adjd*
 F:	drivers/staging/iio/*/ad*
-F:	staging/iio/trigger/iio-trig-bfin-timer.c
+F:	drivers/staging/iio/trigger/iio-trig-bfin-timer.c
 
 ANALOG DEVICES INC DMA DRIVERS
 M:	Lars-Peter Clausen <lars@metafoo.de>