iio: health: max30100: correct FIFO check condition

Correct issue that the last entry in FIFO was being read twice due
to an incorrect decrement of entry count variable before condition
check.

Signed-off-by: Matt Ranostay <mranostay@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/iio/health/max30100.c b/drivers/iio/health/max30100.c
index 09db89359544..90ab8a2d2846 100644
--- a/drivers/iio/health/max30100.c
+++ b/drivers/iio/health/max30100.c
@@ -238,12 +238,13 @@ static irqreturn_t max30100_interrupt_handler(int irq, void *private)
 
         mutex_lock(&data->lock);
 
-        while (cnt-- || (cnt = max30100_fifo_count(data) > 0)) {
+        while (cnt || (cnt = max30100_fifo_count(data) > 0)) {
                 ret = max30100_read_measurement(data);
                 if (ret)
                         break;
 
                 iio_push_to_buffers(data->indio_dev, data->buffer);
+                cnt--;
         }
 
         mutex_unlock(&data->lock);