Fix file descriptor leak on invalid sound formats

Credit goes to cppcheck (http://cppcheck.sourceforge.net)

Signed-off-by: Thomas Jarosch <thomas.jarosch@intra2net.com>
diff -r 60b76397080d Modules/ossaudiodev.c
--- a/Modules/ossaudiodev.c	Thu Sep 29 12:43:18 2011 +0200
+++ b/Modules/ossaudiodev.c	Thu Sep 29 13:22:59 2011 +0200
@@ -129,6 +129,7 @@
     }
 
     if (ioctl(fd, SNDCTL_DSP_GETFMTS, &afmts) == -1) {
+        close(fd);
         PyErr_SetFromErrnoWithFilename(PyExc_IOError, devicename);
         return NULL;
     }