serial: sandbox: use ssize_t to match os_read

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Acked-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/serial/sandbox.c b/drivers/serial/sandbox.c
index cae6c9411c808edb14a8a69eab788da7e29b7385..814a0f9e7fcfc17d7796f03037047f0436cdeacb 100644 (file)
--- a/drivers/serial/sandbox.c
+++ b/drivers/serial/sandbox.c
@@ -50,7 +50,7 @@ void serial_puts(const char *str)
 int serial_getc(void)
 {
        char buf;
-       int count;
+       ssize_t count;
 
        count = os_read(0, &buf, 1);
        return count == 1 ? buf : 0;