ASoC: fsl: fsl_easrc: Fix uninitialized variable st2_mem_alloc

A previous cleanup commit removed the ininitialization of st2_mem_alloc.
Fix this by restoring the original behaviour by initializing it to zero.

Addresses-Coverity: ("Uninitialized scalar variable")
Fixes: e80382fe721f ("ASoC: fsl: fsl_easrc: remove useless assignments")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20210303091835.5024-1-colin.king@canonical.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/fsl/fsl_easrc.c

@@ -710,7 +710,7 @@ static int fsl_easrc_max_ch_for_slot(struct fsl_asrc_pair *ctx,
 				     struct fsl_easrc_slot *slot)
 {
 	struct fsl_easrc_ctx_priv *ctx_priv = ctx->private;
-	int st1_mem_alloc = 0, st2_mem_alloc;
+	int st1_mem_alloc = 0, st2_mem_alloc = 0;
 	int pf_mem_alloc = 0;
 	int max_channels = 8 - slot->num_channel;
 	int channels = 0;