fs: tolerate per-superblock freeze errors on shared devices

When several superblocks share a device, keep it frozen even if some of
them failed to freeze and swallow the error: rolling the others back
via thaw_super() can fail too, so neither is a clear win. A single
filesystem still reports its error, and a sync_blockdev() failure is
always reported. Thaw follows the same rule.

A device can only be shared once superblocks claim it with a common
exclusivity token, which erofs starts doing in the next patch; for
everyone else the loop visits exactly one superblock and the behavior
is unchanged.

Link: https://patch.msgid.link/20260616-work-super-bdev_holder_global-v2-13-7df6b864028e@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

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