audio: avoid latent media server crash during device is booting
Sometimes media server is killed by alsa_ucm during device is booting. A alsa_ucm gets a index of "use case device" from get_use_case_index() function. But, get_use_case_index() function can be returned a wrong value (dev_index = -22 used index of dev_list[] array) at booting time. This patch avoids latent media server crash causing abnormal value as using index of dev_list[] array. Change-Id: I961465f99b994d3ab1b26ee74d6d0978159960f4
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