btrfs: bioset allocations will never fail, adapt our helpers

Christoph pointed out that bio allocations backed by a bioset will never
fail.  As we always use a bioset for all bio allocations, we can skip
the error handling.  This patch adjusts our low-level helpers, the
cascaded changes to all callers will come next.

CC: Liu Bo <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Reviewed-by: Anand Jain <[email protected]>
Signed-off-by: David Sterba <[email protected]>

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