pcm: avoid calling pcm_hw->close() twice

It would result in a double free:

  $ tinyplay example.wav
  failed to open for pcm 0,0
  *** glibc detected *** ./utils/tinyplay: double free or corruption (fasttop): 0x402dc258 ***
  Aborted
  $

The crash happens here:

  Program received signal SIGABRT, Aborted.
  0x40070e78 in raise () from /lib/libc.so.6
  Missing separate debuginfos, use: debuginfo-install glibc-2.16-34.olpc.0.fc18.armv7hl libgcc-4.7.2-8.fc18.armv7hl
  (gdb) bt
  #0  0x40070e78 in raise () from /lib/libc.so.6
  #1  0x400724b8 in abort () from /lib/libc.so.6
  #2  0x400ad6e0 in ?? () from /lib/libc.so.6
  #3  0x400b54e8 in ?? () from /lib/libc.so.6
  #4  0x2a00486c in pcm_hw_close ()
  #5  0x2a0032e0 in pcm_close ()
  #6  0x2a0016b0 in ctx_init ()
  #7  0x2a000c98 in main ()
  (gdb)

The previous free was done here:

  Breakpoint 1, 0x400b8b8c in free () from /lib/libc.so.6
  (gdb) bt
  #0  0x400b8b8c in free () from /lib/libc.so.6
  #1  0x2a00486c in pcm_hw_close ()
  #2  0x2a003674 in pcm_open ()
  #3  0x2a0015e8 in ctx_init ()
  #4  0x2a000c98 in main ()
  (gdb)

0 files changed, 0 insertions, 0 deletions