i2c: fix command usage help

Portions of this work were supported by funding from
the CE Linux Forum.

Signed-off-by: Heiko Schocher <hs@denx.de>

diff --git a/common/cmd_i2c.c b/common/cmd_i2c.c
index 1283c82afb0c6dae2cd6b286b786dee34f407d74..a7b65edd5fcc9dbc149f1d1e8b2455f6853464eb 100644 (file)
--- a/common/cmd_i2c.c
+++ b/common/cmd_i2c.c
@@ -1288,6 +1288,9 @@ static int do_i2c(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
 {
        cmd_tbl_t *c;
 
+       if (argc < 2)
+               return cmd_usage(cmdtp);
+
        /* Strip off leading 'i2c' command argument */
        argc--;
        argv++;