V4L/DVB (7092): radio-sf16fmr2: fix request_region() validation [bugzilla 9699]
This patch changed the request_region() validation to avoid invalid return. Thanks to Roland Kletzing <devzero@web.de> for bug report and data collection. Signed-off-by: NDouglas Schilling Landgraf <dougsland@gmail.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>
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