mm/hmm: always return EBUSY for invalid ranges in hmm_range_{fault,snapshot}

We should not have two different error codes for the same
condition. EAGAIN must be reserved for the FAULT_FLAG_ALLOW_RETRY retry
case and signals to the caller that the mmap_sem has been unlocked.

Use EBUSY for the !valid case so that callers can get the locking right.

Link: https://lore.kernel.org/r/[email protected]
Tested-by: Ralph Campbell <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Ralph Campbell <[email protected]>
Reviewed-by: Jason Gunthorpe <[email protected]>
Reviewed-by: Felix Kuehling <[email protected]>
[jgg: elaborated commit message]
Signed-off-by: Jason Gunthorpe <[email protected]>

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