some manual (unnecessery) free for good manner

its not needed because OS is responsible to cleanup
mem allocated by terminating process, but its still
a good manner to explicitly free everything that gets
allocated...
yes this is "noise" if it terminates but neither does
harm to feel being responsible to clean up everything
ourselves. :)

at least valgrind is silently happy :P :D

challenge/challenge.c

@@ -14,15 +14,18 @@ int main(void) {
     /* read in password from standard input, exit on error. */
     if (getline(&input_line, &input_size, stdin) == -1) {
         perror("Error");
+        free(input_line);
         exit(EXIT_FAILURE);
     }
 
     /* compare password, print info, exit appropriately */
     if (strcmp(input_line, password) == 0) {
         puts("Success!");
+        free(input_line);
         exit(EXIT_SUCCESS);
     } else {
         puts("How about no?!");
+        free(input_line);
         exit(EXIT_FAILURE);
     }
 }