By not assigning opterr, getopt will print its own error message that
includes information about whether an option is unknown or just requires
an additional argument.

Signed-off-by: Thomas Wood <thomas.w...@intel.com>
---
 tests/testdisplay.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/tests/testdisplay.c b/tests/testdisplay.c
index 0fcce19..a0f43e9 100644
--- a/tests/testdisplay.c
+++ b/tests/testdisplay.c
@@ -723,7 +723,6 @@ int main(int argc, char **argv)
 
        enter_exec_path( argv );
 
-       opterr = 0;
        while ((c = getopt(argc, argv, optstr)) != -1) {
                switch (c) {
                case '3':
@@ -771,7 +770,6 @@ int main(int argc, char **argv)
                        sscanf(optarg, "%d,%d", &specified_disp_id, 
&specified_mode_num);
                        break;
                default:
-                       fprintf(stderr, "unknown option %c\n", c);
                        /* fall through */
                case 'h':
                        usage(argv[0]);
-- 
1.8.3.1

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