Hello world,

the attached patch fixes the regression and regtests cleanly.
No test case because I could not find anything portable
to create a FIFO in the testsuite.

OK for trunk and 4.7?

	Thomas

2012-12-15  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR libfortran/30162
         * io/unix.c (raw_tell):  If the lseek is done on a
         non-seekable file, return 0.