net: l2: ieee802154: shell: fix scan argc validation

Bump the argc check from 3 to 4 as the shell scan command has 3 required
parameters, the last being the scan duration:
- argv[0]
- passive|active
- channels
- per-channel duration in ms

(cherry picked from commit 732a3a5)

Original-Signed-off-by: Simon Piriou <[email protected]>
GitOrigin-RevId: 732a3a5
Cr-Build-Id: 8709847665304561137
Cr-Build-Url: https://cr-buildbucket.appspot.com/build/8709847665304561137
Copybot-Job-Name: zephyr-main-copybot-downstream
Change-Id: I622c091b588e37cea923ba042092b02485a313de
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/zephyr/+/6717684
Commit-Queue: ChromeOS Copybot <[email protected]>
Tested-by: ChromeOS Copybot <[email protected]>
Bot-Commit: ChromeOS Copybot <[email protected]>

Author: Simon Piriou

subsys/net/l2/ieee802154/ieee802154_shell.c

@@ -227,7 +227,7 @@ static int cmd_ieee802154_scan(const struct shell *sh,
 	uint64_t scan_type;
 	int ret = 0;
 
-	if (argc < 3) {
+	if (argc < 4) {
 		shell_help(sh);
 		return -ENOEXEC;
 	}