rpc: socket: properly call virSetCloseExec

cppcheck reports:
style: Argument 'fd<0' to function virSetCloseExec is always 0 [knownArgument]

Signed-off-by: Ján Tomko <jtomko@redhat.com>
Fixes: 4b9919af4024a6fbc3d4ee996d8a4c27dbc44285
Reviewed-by: Peter Krempa <pkrempa@redhat.com>

src/rpc/virnetsocket.c

@@ -1388,7 +1388,7 @@ int virNetSocketDupFD(virNetSocketPtr sock, bool cloexec)
     }
 #ifndef F_DUPFD_CLOEXEC
     if (cloexec &&
-        virSetCloseExec(fd < 0)) {
+        virSetCloseExec(fd) < 0) {
         int saveerr = errno;
         closesocket(fd);
         errno = saveerr;