user_call: Fix warning about void pointer arithmetic.

user_io.c
user_io.c: In function ‘flush_output’:
user_io.c:70:7: warning: pointer of type ‘void *’ used in arithmetic [-Wpointer-arith]
   buf += paclen_out;
       ^~

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/user_call/user_io.c b/user_call/user_io.c
index 0a25136..3c7e9d5 100644
--- a/user_call/user_io.c
+++ b/user_call/user_io.c
@@ -62,12 +62,13 @@ void end_compress(void)
 
 static int flush_output(int fd, const void *buf, size_t count)
 {
+	const unsigned char *byte = buf;
 	int cnt = count;
 
 	while (cnt > 0) {
-		if (write(fd, buf, min(paclen_out, cnt)) < 0)
+		if (write(fd, byte, min(paclen_out, cnt)) < 0)
 			return -1;
-		buf += paclen_out;
+		byte += paclen_out;
 		cnt -= paclen_out;
 	}