configure: Fix compiler warning in config.log (unused variable)

warning: unused variable ‘iov’

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

diff --git a/configure b/configure
index 4e596e6..f2c2a27 100755 (executable)
--- a/configure
+++ b/configure
@@ -2060,7 +2060,7 @@ cat > $TMPC <<EOF
 #include <sys/types.h>
 #include <sys/uio.h>
 #include <unistd.h>
-int main(void) { struct iovec iov; return 0; }
+int main(void) { return sizeof(struct iovec); }
 EOF
 iovec=no
 if compile_prog "" "" ; then