cmd: ethsw: Fix out-of-bounds error

The for loop in cmd_keywords_opt_check() seems to use wrong array to
set boundary, reported by Coverity analysis.

Signed-off-by: York Sun <york.sun@nxp.com>
CC: Joe Hershberger <joe.hershberger@ni.com>
CC: Tom Rini <trini@konsulko.com>
CC: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
Reported-by: Coverity (CID: 163251)
Reviewed-by: Tom Rini <trini@konsulko.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

cmd/ethsw.c

@@ -915,7 +915,7 @@ static void cmd_keywords_opt_check(const struct ethsw_command_def *parsed_cmd,
 	 * check if our command's optional keywords match the optional
 	 * keywords of an available command
 	 */
-	for (i = 0; i < ARRAY_SIZE(ethsw_cmd_def); i++) {
+	for (i = 0; i < ARRAY_SIZE(cmd_opt_def); i++) {
 		keyw_opt_matched = 0;
 		cmd_keyw_p = &parsed_cmd->cmd_to_keywords[keyw_opt_matched];
 		cmd_keyw_opt_p = &cmd_opt_def[i].cmd_keyword[keyw_opt_matched];