command-not-found: Always return an error (#566)

Fixes #564

packages/command-not-found/command-not-found.c

@@ -43,7 +43,7 @@ int main(int argc, char** argv) {
 			int distance = termux_levenshtein_distance(command_not_found, binary_name);
 			if (distance == 0 && strcmp(command_not_found, binary_name) == 0) {
 				printf("The program '%s' is not installed. Install it by executing:\n apt install %s\n", binary_name, current_package);
-				return 0;
+				return 127;
 			} else if (best_distance == distance) {
 				guesses_at_best_distance++;
 			} else if (best_distance == -1 || best_distance > distance) {
@@ -80,5 +80,6 @@ int main(int argc, char** argv) {
 			}
 		}
 	}
+	return 127;
 }