audio: clean up the build warning issue. [2/2]

PD#SWPL-161468

Problem:
clean up build warning issue

Solution:
clean up build warning issue

Verify:
./run.do_compile

Change-Id: Iba011254b9030ea641fdedaf3a398a67307e1830
Signed-off-by: haiyang.ren <haiyang.ren@amlogic.com>
diff --git a/include/IpcBuffer/IpcBuffer_c.h b/include/IpcBuffer/IpcBuffer_c.h
index 9250f40..d376b2a 100644
--- a/include/IpcBuffer/IpcBuffer_c.h
+++ b/include/IpcBuffer/IpcBuffer_c.h
@@ -31,6 +31,8 @@
 
 extern void IpcBuffer_inc_underrun(void *instance);
 
+extern void IpcBuffer_setMeta(void *instance, uint64_t meta_64, uint32_t meta_32);
+
 extern void IpcBuffer_add_silence(void *instance, size_t size);
 
 #ifdef __cplusplus