tools:iio:iio_generic_buffer: fix trigger-less mode

Passing the trigger-less mode option on the command line causes
iio_generic_buffer to fail searching for an IIO trigger.
Fix this by skipping trigger initialization if trigger-less mode is
requested.

Technically it actually fixes:
7c7e9dad70 where the bug was introduced but as the window to the patch
below that changes the context was very small let's mark it with that.

Signed-off-by: Gregor Boirie <gregor.boirie@parrot.com>
Fixes: deb4d1fdcb5af ("iio: generic_buffer: Fix --trigger-num option")
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

tools/iio/iio_generic_buffer.c

@@ -456,7 +456,7 @@ int main(int argc, char **argv)
 
 	if (notrigger) {
 		printf("trigger-less mode selected\n");
-	} if (trig_num >= 0) {
+	} else if (trig_num >= 0) {
 		char *trig_dev_name;
 		ret = asprintf(&trig_dev_name, "%strigger%d", iio_dir, trig_num);
 		if (ret < 0) {