Fix rm hard link problem

Add the inode name compration in the unlink function

Since the hard link uses the same inode number as the original file
inode, it's necessary to check the name to prevent deletion of the
wrong inode.

Author: RoyWFHuang

inode.c

@@ -472,7 +472,8 @@ static int simplefs_remove_from_dir(struct inode *dir, struct dentry *dentry)
             }
             /* Remove file from parent directory */
             for (fi = 0; fi < SIMPLEFS_FILES_PER_BLOCK; fi++) {
-                if (dblock->files[fi].inode == inode->i_ino) {
+                if (dblock->files[fi].inode == inode->i_ino &&
+                    !strcmp(dblock->files[fi].filename, dentry->d_name.name) ) {
                     found = true;
                     if (fi != SIMPLEFS_FILES_PER_BLOCK - 1) {
                         memmove(dblock->files + fi, dblock->files + fi + 1,