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path: root/drivers/serial/usbtty.c
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-rw-r--r--drivers/serial/usbtty.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/serial/usbtty.c b/drivers/serial/usbtty.c
index 7fb0b92078..75f0ec31bb 100644
--- a/drivers/serial/usbtty.c
+++ b/drivers/serial/usbtty.c
@@ -882,7 +882,7 @@ static int write_buffer (circbuf_t * buf)
space_avail =
current_urb->buffer_length -
current_urb->actual_length;
- popnum = min(space_avail, buf->size);
+ popnum = min(space_avail, (int)buf->size);
if (popnum == 0)
break;
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