alsa_sound: Fix for unhandled NULL pointer
-Passing NULL pointer to pcm_read()/pcm_write()/ pcm_prepare() would crash, since it doesnt perform a NULL check before using the pointer, resulting in random crash -Fix is to check whether handle is NULL or not. Change-Id: I7061d40bddcaaae2145f5fc0a0229abeebead878 CRs-fixed: 549257
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