Change inode cache in main.c to inode table

kernel/main.c

@@ -25,7 +25,7 @@ main()
     plicinit();      // set up interrupt controller
     plicinithart();  // ask PLIC for device interrupts
     binit();         // buffer cache
-    iinit();         // inode cache
+    iinit();         // inode table
     fileinit();      // file table
     virtio_disk_init(); // emulated hard disk
     userinit();      // first user process