configure: Fix build with capabilities

Since commit 417c9d72d48275d19c60861896efd4962d21aca2 all configure tests
normally run with -Werror. Some of these tests now fail because they
raised a compiler warning.

This patch fixes support for capabilities.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/configure b/configure
index 0a2226bb7e..ec95819f6e 100755
--- a/configure
+++ b/configure
@@ -2085,7 +2085,7 @@ if test "$cap" != "no" ; then
   cat > $TMPC <<EOF
 #include <stdio.h>
 #include <sys/capability.h>
-int main(void) { cap_t caps; caps = cap_init(); }
+int main(void) { cap_t caps; caps = cap_init(); return caps != NULL; }
 EOF
   if compile_prog "" "-lcap" ; then
     cap=yes