rtac: Fix return value of misc_register in init

Return error only on failure else success.

CRs-Fixed: 2204093
Change-Id: I616dbf41fb297f16b63d8108eff699703ea94177
Signed-off-by: Vignesh Kulothungan <vigneshk@codeaurora.org>

dsp/rtac.c

@@ -2051,7 +2051,10 @@ int __init rtac_init(void)
 		kzfree(rtac_asm_buffer);
 		kzfree(rtac_afe_buffer);
 		kzfree(rtac_voice_buffer);
+		goto nomem;
 	}
+
+	return 0;
 nomem:
 	return -ENOMEM;
 }