Drop warning in wrynose

Drop warning due to missing space :
"has a lack of whitespace around the assignment: 'CONVERSION_CMD:enc.."

Signed-off-by: Stefano Babic <stefano.babic@swupdate.org>

classes-recipe/swupdate-enc.bbclass

@@ -20,4 +20,4 @@ swu_encrypt_file() {
 CONVERSIONTYPES += "enc"
 
 CONVERSION_DEPENDS_enc = "openssl-native coreutils-native"
-CONVERSION_CMD:enc="swu_encrypt_file ${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.${type} ${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.${type}.enc"
+CONVERSION_CMD:enc = "swu_encrypt_file ${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.${type} ${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.${type}.enc"