staging: comedi: non working tests on unsigned cmd->convert_arg

[Roel Kluin <roel.kluin@gmail.com>]

vi drivers/staging/comedi/comedi.h +342

and note that cmd->convert_arg in s626_ai_cmdtest() is unsigned. Should there
maybe be a test:

if (cmd->convert_src == TRIG_EXT && cmd->convert_arg > MAX)

(and what should MAX be then?)

Otherwise you may want to apply the cleanup patch below

Roel
------------------------------>8-------------8<---------------------------------
Remove redundant tests on unsigned

Signed-off-by: Roel Kluin <roel.kluin@gmail.com> 
---
diff --git a/drivers/staging/comedi/drivers/s626.c b/drivers/staging/comedi/drivers/s626.c
index 30dec9d..928c4c6 100644
--- a/drivers/staging/comedi/drivers/s626.c
+++ b/drivers/staging/comedi/drivers/s626.c
@@ -1906,7 +1906,7 @@ static int s626_ai_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s
 		err++;
 	}
 
-	if (cmd->convert_src == TRIG_EXT && cmd->convert_arg < 0) {
+	if (cmd->convert_src == TRIG_EXT) {
 		cmd->convert_arg = 0;
 		err++;
 	}