[osal/linux]: fix compiling error on linux

git-svn-id: https://10.10.10.66:8443/svn/MediaProcessPlatform/trunk/mpp@100 6e48237b-75ef-9749-8fc9-41990f28c85a

osal/linux/os_mem.c

@@ -22,6 +22,13 @@ int os_malloc(void **memptr, size_t alignment, size_t size)
     return posix_memalign(memptr, alignment, size);
 }
 
+int os_realloc(void *src, void **dst, size_t alignment, size_t size)
+{
+    (void)alignment;
+    *dst = realloc(src, size);
+    return (*dst) ? (0) : (-1);
+}
+
 void os_free(void *ptr)
 {
     free(ptr);