Change into the root dir of the FS directly after mounting.

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@11585 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/tests/add-ons/kernel/file_systems/fs_shell/initfs.c

@@ -47,5 +47,12 @@ init_fs(char *disk_name)
         exit(0);
     }
 
+	err = sys_chdir(1, -1, "/myfs");
+	if (err != 0) {
+		printf("Failed to cd into /myfs.");
+		sys_unmount(1, -1, "/myfs");
+		exit(0);
+	}
+    
     return data;
 }