Fixing typo at the REUSE helper message

Signed-off-by: Ricardo Salveti de Araujo <ricardo.salveti@linaro.org>

 2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/build-images b/build-images
index c04abf5..c66d24d 100755
--- a/build-images
+++ b/build-images
@@ -56,7 +56,7 @@
 fi
 
 if [ -d ${OUTDIR} ] && [ -z $REUSE ] ; then
-	echo "ERROR: directory [$OUTDIR] already exists. Delete this or run with RESUSE=1"
+	echo "ERROR: directory [$OUTDIR] already exists. Delete this or run with REUSE=1"
 	exit 1
 fi