SDCARD-RAW-TOOLS: Abort if user opts to not overwrite raw image file

Otherwise, it will be overwritten anyway.

recipes-devtools/sdcard-raw-tools/sdcard-raw-tools/create_sdcard_from_flashlayout.sh

@@ -833,6 +833,9 @@ else
 		read answer
 		if [[ "$answer" =~ ^[Yy]+[ESes]* ]]; then
 			rm -f $FLASHLAYOUT_rawname $FLASHLAYOUT_infoname
+		else
+			echo "Cannot continue."
+			exit 1
 		fi
 	fi