cansequence: main(): error handling: add "()" to function name in err…

…or message

Commit 0be066b ("cansequence: main(): allow to bind on "any"
interface") converted from SIOCGIFINDEX ioctl() to if_nametoindex()
and adjusted the error message, but forgot the "()" after the function
name, which is used in the rest of the error messages in this file.

Add the missing "()".

Fixes: 0be066b ("cansequence: main(): allow to bind on "any" interface")

cansequence.c

@@ -347,7 +347,7 @@ int main(int argc, char **argv)
 	if (strcmp(ANYDEV, interface)) {
 		addr.can_ifindex = if_nametoindex(interface);
 		if (!addr.can_ifindex) {
-			perror("if_nametoindex");
+			perror("if_nametoindex()");
 			exit(EXIT_FAILURE);
 		}
 	}