log: Don't modify global @errno in __print_on_level
log: Don't modify global @errno in __print_on_level

The __print_on_level routine may modify global @errno
variable which is inacceptable: this is logging routine
which must be transparent to the rest of the program code.

Thus save @errno in local @__errno variable and restore
it on return.

Signed-off-by: Cyrill Gorcunov <7a1ea01eee6961eb1e372e3508c2670446d086f4@openvz.org>
Acked-by: Andrew Vagin <74c05afa918858348d6db8037d82fa8124870113@parallels.com>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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