i2c-tools: fix 'i2cdetect -l'

Calling 'i2cdetect -l' only displays usage and exits. Fix it by
correctly parsing command-line arguments.

Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/miscutils/i2c_tools.c b/miscutils/i2c_tools.c
index 03bb03974..2805cf3b0 100644
--- a/miscutils/i2c_tools.c
+++ b/miscutils/i2c_tools.c
@@ -1284,13 +1284,16 @@ int i2cdetect_main(int argc UNUSED_PARAM, char **argv)
         unsigned opts;
 
         opt_complementary = "q--r:r--q:" /* mutually exclusive */
-                        "-1:?3"; /* from 1 to 3 args */
+                        "?3"; /* up to 3 args */
         opts = getopt32(argv, optstr);
         argv += optind;
 
         if (opts & opt_l)
                 list_i2c_busses_and_exit();
 
+        if (!argv[0])
+                bb_show_usage();
+
         bus_num = i2c_bus_lookup(argv[0]);
         fd = i2c_dev_open(bus_num);
         get_funcs_matrix(fd, &funcs);