drouting: Fix 'inherit_reload' related errors on MI reloads

Related to e871882.  Be silent about "MI param not found" errors, in
case the function was _meant_ to be called without those parameters.

(cherry picked from commit 47fbe36)

mi/item.c

@@ -476,21 +476,17 @@ int get_mi_bool_like_param(const mi_params_t *params, char *name,
 {
 	str tmp;
 
-	if (get_mi_string_param(params, name, &tmp.s, &tmp.len) < 0) {
+	if (try_get_mi_string_param(params, name, &tmp.s, &tmp.len) != 0)
 		return default_value;
-	}
 
-	if (tmp.len != 1) {
+	if (tmp.len != 1)
 		return default_value;
-	}
 
-	if (tmp.s[0] == '0' || tmp.s[0] == 'n' || tmp.s[0] == 'N') {
+	if (tmp.s[0] == '0' || tmp.s[0] == 'n' || tmp.s[0] == 'N')
 		return 0;
-	}
 
-	if (tmp.s[0] == '1' || tmp.s[0] == 'y' || tmp.s[0] == 'Y') {
+	if (tmp.s[0] == '1' || tmp.s[0] == 'y' || tmp.s[0] == 'Y')
 		return 1;
-	}
 
 	return default_value;
 }

modules/drouting/drouting.c

@@ -537,7 +537,7 @@ static const mi_export_t mi_cmds[] = {
 		{dr_reload_cmd, {0}},
 		{dr_reload_cmd, {"inherit_state", 0}},
 		{dr_reload_cmd_1, {"partition_name", 0}},
-		{dr_reload_cmd_1, {"partition_name", "inhert_state", 0}},
+		{dr_reload_cmd_1, {"partition_name", "inherit_state", 0}},
 		{EMPTY_MI_RECIPE}}
 	},
 	{ "dr_gw_status", HLP2, MI_NAMED_PARAMS_ONLY, 0, {