litle fix for oss output driver
litle fix for oss output driver

The driver checked the filedescriptor wrong.

Invalid ones should have the vallue < 0 and vallid ones >= 0.

Signed-off-by: Halim Sahin <cfbad4e842d1fb1513cefabb3ad0ef6bcb9a63f2@t-online.de>

razr/speechd,razr/speechd,razr/speechd,razr/speechd