Fix mingw32 build warnings

Work around buffer and ioctlsocket argument type signedness problems
Suppress a prototype which is unused on mingw32
Expand a macro to avoid warnings from some GCC versions

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

1 files changed, 1 insertions, 1 deletions

diff --git a/savevm.c b/savevm.c
index cae711762d..61edd7e458 100644
--- a/savevm.c
+++ b/savevm.c
@@ -190,7 +190,7 @@ static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
     ssize_t len;
 
     do {
-        len = recv(s->fd, buf, size, 0);
+        len = recv(s->fd, (void *)buf, size, 0);
     } while (len == -1 && socket_error() == EINTR);
 
     if (len == -1)