kdb: Replace strncmp with str_has_prefix

strncmp(str, const, len) is error-prone.
We had better use newly introduced
str_has_prefix() instead of it.

Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>

diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index 9ecfa37..4567fe9 100644 (file)
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -830,7 +830,7 @@ static void parse_grep(const char *str)
        cp++;
        while (isspace(*cp))
                cp++;
-       if (strncmp(cp, "grep ", 5)) {
+       if (!str_has_prefix(cp, "grep ")) {
                kdb_printf("invalid 'pipe', see grephelp\n");
                return;
        }