knsupdate: autocomplete - fix wrong pointer iteration

src/utils/knsupdate/knsupdate_exec.c

@@ -67,7 +67,7 @@ int cmd_zone(const char* lp, knsupdate_params_t *params);
  * This way we could identify command byte-per-byte and
  * cancel early if the next is lexicographically greater.
  */
-const char* knsupdate_cmd_array[] = {
+const char* const knsupdate_cmd_array[] = {
 	"\x3" "add",
 	"\x6" "answer",
 	"\x5" "class",         /* {classname} */

src/utils/knsupdate/knsupdate_exec.h

@@ -18,7 +18,7 @@
 
 #include "utils/knsupdate/knsupdate_params.h"
 
-extern const char* knsupdate_cmd_array[];
+extern const char* const knsupdate_cmd_array[];
 
 int knsupdate_exec(knsupdate_params_t *params);
 

src/utils/knsupdate/knsupdate_interactive.c

@@ -90,7 +90,7 @@ static unsigned char complete(EditLine *el, int ch)
 	// Find the command descriptor.
 	const char **desc = knsupdate_cmd_array;
 	while (*desc != NULL && strcmp((*desc) + 1, argv[0]) != 0) {
-		(*desc)++;
+		desc++;
 	}
 	if (*desc == NULL) {
 		goto complete_exit;