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Prevent the call to pcm->ops-close() if pcm->ops->open() fail.
Fix memory leak in pcm_hw_open() in case of failure.
* thread #1, name = 'ut', stop reason = signal SIGSEGV: invalid address (fault address: 0x8)
frame #0: 0x00007ffff7f863e8 libtinyalsa.so.1`pcm_hw_close(data=0x0000000000000000) at pcm_hw.c:61:21
58 {
59 struct pcm_hw_data *hw_data = data;
60
-> 61 if (hw_data->fd > 0)
62 close(hw_data->fd);
63
64 free(hw_data);
(lldb) bt
* thread #1, name = 'ut', stop reason = signal SIGSEGV: invalid address (fault address: 0x8)
* frame #0: 0x00007ffff7f863e8 libtinyalsa.so.1`pcm_hw_close(data=0x0000000000000000) at pcm_hw.c:61:21
frame #1: 0x00007ffff7f8491c libtinyalsa.so.1`pcm_close(pcm=0x0000000000a9eba0) at pcm.c:820:5
frame #2: 0x00007ffff7f84e0a libtinyalsa.so.1`pcm_open(card=128, device=0, flags=13, config=0x00007fffffffd000) at pcm.c:957:5
Signed-off-by: Miguel GAIO <mgaio35@gmail.com>
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