ASoC: codecs: wcd938x: fix missing mbhc init error handling

In the Linux kernel, the following vulnerability has been resolved:

ASoC: codecs: wcd938x: fix missing mbhc init error handling

MBHC initialisation can fail so add the missing error handling to avoid

dereferencing an error pointer when later configuring the jack:

Unable to handle kernel paging request at virtual address fffffffffffffff8

pc : wcd_mbhc_start+0x28/0x380 [snd_soc_wcd_mbhc]

lr : wcd938x_codec_set_jack+0x28/0x48 [snd_soc_wcd938x]

Call trace:

wcd_mbhc_start+0x28/0x380 [snd_soc_wcd_mbhc]

wcd938x_codec_set_jack+0x28/0x48 [snd_soc_wcd938x]

snd_soc_component_set_jack+0x28/0x8c [snd_soc_core]

qcom_snd_wcd_jack_setup+0x7c/0x19c [snd_soc_qcom_common]

sc8280xp_snd_init+0x20/0x2c [snd_soc_sc8280xp]

snd_soc_link_init+0x28/0x90 [snd_soc_core]

snd_soc_bind_card+0x628/0xbfc [snd_soc_core]

snd_soc_register_card+0xec/0x104 [snd_soc_core]

devm_snd_soc_register_card+0x4c/0xa4 [snd_soc_core]

sc8280xp_platform_probe+0xf0/0x108 [snd_soc_sc8280xp]