apps: make memeater use perror

apps/src/memeater.c

@@ -15,6 +15,6 @@ int main()
         printf("Allocating 4 MB of memory... %lx\n", (unsigned long)allocated);
         sleep(1);
     } while ((allocated = malloc(CHUNK)));
-    printf("Out of memory. (errno=%d, %s)\n", errno, strerror(errno));
+    perror("malloc");
     printf("Press any key to restart.\n");
 }