CMSG_DATA should return an unsigned char*.
http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_socket.h.html
> CMSG_DATA(cmsg)
> If the argument is a pointer to a cmsghdr structure, this macro
> shall return an unsigned character pointer to the data array
> associated with the cmsghdr structure.
Change-Id: I3f89ba19cbca4e6727abc65a2bbcd59267892ba8
diff --git a/libc/include/sys/socket.h b/libc/include/sys/socket.h
index 43d1586..ff8a815 100644
--- a/libc/include/sys/socket.h
+++ b/libc/include/sys/socket.h
@@ -109,7 +109,7 @@
#define CMSG_NXTHDR(mhdr, cmsg) __cmsg_nxthdr((mhdr), (cmsg))
#define CMSG_ALIGN(len) ( ((len)+sizeof(long)-1) & ~(sizeof(long)-1) )
-#define CMSG_DATA(cmsg) ((void*)((char*)(cmsg) + CMSG_ALIGN(sizeof(struct cmsghdr))))
+#define CMSG_DATA(cmsg) (((unsigned char*)(cmsg) + CMSG_ALIGN(sizeof(struct cmsghdr))))
#define CMSG_SPACE(len) (CMSG_ALIGN(sizeof(struct cmsghdr)) + CMSG_ALIGN(len))
#define CMSG_LEN(len) (CMSG_ALIGN(sizeof(struct cmsghdr)) + (len))
#define CMSG_FIRSTHDR(msg) \
