slirp: fix unused return value, spotted by clang

Fix clang errors like:
  CC    slirp/cksum.o
/src/qemu/slirp/cksum.c:78:3: error: expression result unused [-Wunused-value]
                REDUCE;
/src/qemu/slirp/cksum.c:45:66: note: instantiated from:

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

diff --git a/slirp/cksum.c b/slirp/cksum.c
index a044ec17ccb0bf26fadbe9f000468ec8481c3006..c3b45f7b3d7a9754be06d8d6feea724aac2e7eaa 100644 (file)
--- a/slirp/cksum.c
+++ b/slirp/cksum.c
@@ -42,7 +42,8 @@
  */
 
 #define ADDCARRY(x)  (x > 65535 ? x -= 65535 : x)
-#define REDUCE {l_util.l = sum; sum = l_util.s[0] + l_util.s[1]; ADDCARRY(sum);}
+#define REDUCE {l_util.l = sum; sum = l_util.s[0] + l_util.s[1];        \
+        (void)ADDCARRY(sum);}
 
 int cksum(struct mbuf *m, int len)
 {