slirp: Fix compiler warning for w64

Casting a pointer to an integer value must use uintptr_t or intptr_t
(not long) for portable code. MinGW-w64 requires this because
sizeof(long) != sizeof(void *) for w64 hosts, so casting to long
raises a compiler warning.

I use uintptr_t instead of intptr_t because changing the sign does not
matter here and casting pointers to unsigned values seems more
reasonable (the unsigned value is a non negative offset.

Cc: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/cksum.c b/cksum.c
index 42adba3..a791770 100644
--- a/cksum.c
+++ b/cksum.c
@@ -79,7 +79,7 @@ int cksum(struct mbuf *m, int len)
     /*
      * Force to even boundary.
      */
-    if ((1 & (long)w) && (mlen > 0)) {
+    if ((1 & (uintptr_t)w) && (mlen > 0)) {
         REDUCE;
         sum <<= 8;
         s_util.c[0] = *(uint8_t *)w;