Fix the potential vunerability of current working directory being off the chroot

Merged upstream in 0.7.0

diff --git a/src/dionaea.c b/src/dionaea.c

index e52673d..88ac690 100644

--- a/src/dionaea.c

+++ b/src/dionaea.c

@@ -720,7 +720,8 @@ opt->stdOUT.filter);

 	// chroot

 	if( opt->root != NULL )

 	{

-		if ( chroot(opt->root) != 0 )

+		/* change working dir to the new root directory and chroot */

+		if ( chdir(opt->root) != 0 && chroot(opt->root) != 0 )

 		{

 			g_error("Could not chroot(\"%s\") (%s)", opt->root, strerror(errno));

 		} else