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44c5ba96ec
When help ('?') option is passed to the command, the help text
printed but not from '?' switch case of getopt_long() but as a
invalid argument as below. Fix this by adding '?' to opt_String
of getopt_long().
root@am437x-evm:~# ./iio_generic_buffer -?
./iio_generic_buffer: invalid option -- '?'
Usage: generic_buffer [options]...
Capture, convert and output data from IIO device buffer
-a Auto-activate all available channels
...
Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>