[PATCH] readline_simple: Fix compiler warning

[Sascha Hauer]

char is an unsigned type. To test the getchar() return value against
negative values we have to use a signed type. Use int instead.

Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
 lib/readline_simple.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/readline_simple.c b/lib/readline_simple.c
index fcdbca41a9..2e52bfc2a0 100644
--- a/lib/readline_simple.c
+++ b/lib/readline_simple.c
@@ -44,7 +44,7 @@ int readline (const char *prompt, char *line, int len)
 	int	n = 0;				/* buffer index		*/
 	int	plen = 0;			/* prompt length	*/
 	int	col;				/* output column cnt	*/
-	char	c;
+	int	c;
 
 	/* print prompt */
 	if (prompt) {
-- 
2.29.2