rsync method incorrectly sets RSYNC_RSH

[Martin Joerg]

Hi,

it looks like commit 5d614887 introduced an issue with the rsync method which
occurs unless tramp-use-ssh-controlmaster-options is t and
tramp-ssh-controlmaster-options is non-empty.

When opening a file larger than tramp-copy-size-limit using the rsync method
the environment variable RSYNC_RSH is set to "", which causes the error
"rsync: [Receiver] Failed to exec server: No such file or directory (2)".

The attached patch fixes the issue for me.

Best regards

Martin

tramp-rsync.patch
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