hfsplus: fix KMSAN uninit-value issue in hfsplus_delete_cat()

In the Linux kernel, the following vulnerability has been resolved:

hfsplus: fix KMSAN uninit-value issue in hfsplus_delete_cat()

The syzbot reported issue in hfsplus_delete_cat():

[ 70.682285][ T9333] =====================================================

[ 70.682943][ T9333] BUG: KMSAN: uninit-value in hfsplus_subfolders_dec+0x1d7/0x220

[ 70.683640][ T9333] hfsplus_subfolders_dec+0x1d7/0x220

[ 70.684141][ T9333] hfsplus_delete_cat+0x105d/0x12b0

[ 70.684621][ T9333] hfsplus_rmdir+0x13d/0x310

[ 70.685048][ T9333] vfs_rmdir+0x5ba/0x810

[ 70.685447][ T9333] do_rmdir+0x964/0xea0

[ 70.685833][ T9333] __x64_sys_rmdir+0x71/0xb0

[ 70.686260][ T9333] x64_sys_call+0xcd8/0x3cf0

[ 70.686695][ T9333] do_syscall_64+0xd9/0x1d0

[ 70.687119][ T9333] entry_SYSCALL_64_after_hwframe+0x77/0x7f

[ 70.687646][ T9333]

[ 70.687856][ T9333] Uninit was stored to memory at:

[ 70.688311][ T9333] hfsplus_subfolders_inc+0x1c2/0x1d0

[ 70.688779][ T9333] hfsplus_create_cat+0x148e/0x1800

[ 70.689231][ T9333] hfsplus_mknod+0x27f/0x600

[ 70.689730][ T9333] hfsplus_mkdir+0x5a/0x70

[ 70.690146][ T9333] vfs_mkdir+0x483/0x7a0

[ 70.690545][ T9333] do_mkdirat+0x3f2/0xd30

[ 70.690944][ T9333] __x64_sys_mkdir+0x9a/0xf0

[ 70.691380][ T9333] x64_sys_call+0x2f89/0x3cf0

[ 70.691816][ T9333] do_syscall_64+0xd9/0x1d0

[ 70.692229][ T9333] entry_SYSCALL_64_after_hwframe+0x77/0x7f

[ 70.692773][ T9333]

[ 70.692990][ T9333] Uninit was stored to memory at:

[ 70.693469][ T9333] hfsplus_subfolders_inc+0x1c2/0x1d0

[ 70.693960][ T9333] hfsplus_create_cat+0x148e/0x1800

[ 70.694438][ T9333] hfsplus_fill_super+0x21c1/0x2700

[ 70.694911][ T9333] mount_bdev+0x37b/0x530

[ 70.695320][ T9333] hfsplus_mount+0x4d/0x60

[ 70.695729][ T9333] legacy_get_tree+0x113/0x2c0

[ 70.696167][ T9333] vfs_get_tree+0xb3/0x5c0

[ 70.696588][ T9333] do_new_mount+0x73e/0x1630

[ 70.697013][ T9333] path_mount+0x6e3/0x1eb0

[ 70.697425][ T9333] __se_sys_mount+0x733/0x830

[ 70.697857][ T9333] __x64_sys_mount+0xe4/0x150

[ 70.698269][ T9333] x64_sys_call+0x2691/0x3cf0

[ 70.698704][ T9333] do_syscall_64+0xd9/0x1d0

[ 70.699117][ T9333] entry_SYSCALL_64_after_hwframe+0x77/0x7f

[ 70.699730][ T9333]

[ 70.699946][ T9333] Uninit was created at:

[ 70.700378][ T9333] __alloc_pages_noprof+0x714/0xe60

[ 70.700843][ T9333] alloc_pages_mpol_noprof+0x2a2/0x9b0

[ 70.701331][ T9333] alloc_pages_noprof+0xf8/0x1f0

[ 70.701774][ T9333] allocate_slab+0x30e/0x1390

[ 70.702194][ T9333] ___slab_alloc+0x1049/0x33a0

[ 70.702635][ T9333] kmem_cache_alloc_lru_noprof+0x5ce/0xb20

[ 70.703153][ T9333] hfsplus_alloc_inode+0x5a/0xd0

[ 70.703598][ T9333] alloc_inode+0x82/0x490

[ 70.703984][ T9333] iget_locked+0x22e/0x1320

[ 70.704428][ T9333] hfsplus_iget+0x5c/0xba0

[ 70.704827][ T9333] hfsplus_btree_open+0x135/0x1dd0

[ 70.705291][ T9333] hfsplus_fill_super+0x1132/0x2700

[ 70.705776][ T9333] mount_bdev+0x37b/0x530

[ 70.706171][ T9333] hfsplus_mount+0x4d/0x60

[ 70.706579][ T9333] legacy_get_tree+0x113/0x2c0

[ 70.707019][ T9333] vfs_get_tree+0xb3/0x5c0

[ 70.707444][ T9333] do_new_mount+0x73e/0x1630

[ 70.707865][ T9333] path_mount+0x6e3/0x1eb0

[ 70.708270][ T9333] __se_sys_mount+0x733/0x830

[ 70.708711][ T9333] __x64_sys_mount+0xe4/0x150

[ 70.709158][ T9333] x64_sys_call+0x2691/0x3cf0

[ 70.709630][ T9333] do_syscall_64+0xd9/0x1d0

[ 70.710053][ T9333] entry_SYSCALL_64_after_hwframe+0x77/0x7f

[ 70.710611][ T9333]

[ 70.710842][ T9333] CPU: 3 UID: 0 PID: 9333 Comm: repro Not tainted 6.12.0-rc6-dirty #17

[ 70.711568][ T9333] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014

[ 70.712490][ T9333] =====================================================

[ 70.713085][ T9333] Disabling lock debugging due to kernel taint

[ 70.713618][ T9333] Kernel panic - not syncing: kmsan.panic set ...

[ 70.714159][ T9333]

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