Fix warning from sparse

Remove unnecessary declaration for errno (this fixes a warning from sparse)
Signed-off-by: NStefan Weil <weil@mail.berlios.de>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5833 c046a42c-6fe2-441c-8c8c-71466251a162

qemu-char.c

@@ -452,7 +452,6 @@ int send_all(int fd, const void *buf, int len1)
     while (len > 0) {
         ret = send(fd, buf, len, 0);
         if (ret < 0) {
-            int errno;
             errno = WSAGetLastError();
             if (errno != WSAEWOULDBLOCK) {
                 return -1;