Exit when image number is finish. Remove a warning

i_pngfile/i_pngfile.cpp

@@ -16,7 +16,7 @@ int check_or_update_blc_channel_name(char const**name){
     
     pid_pos=strstr(*name, "<pid>");
     if (pid_pos) {
-        asprintf(&new_name, "%.*s%d", (int)(pid_pos-*name), *name, getpid());
+        SYSTEM_ERROR_CHECK(asprintf(&new_name, "%.*s%d", (int)(pid_pos-*name), *name, getpid()), -1, "Allocating default image name");
         *name=new_name;
     }
     
@@ -78,11 +78,13 @@ int main(int argc, char**argv){
     BLC_COMMAND_LOOP(period){
         //If we have a number of images to load and we have not finish
         blc_image_update_with_png_file(&output, final_filename);
-        if (images_nb_str && image_id != images_nb-1) {
-            SPRINTF(final_filename, filename, image_id);
-            image_id++;
-        }
-        
+        if (images_nb_str){
+		if ( image_id == images_nb-1) blc_command_ask_quit();
+		else {
+        	    SPRINTF(final_filename, filename, image_id);
+        	    image_id++;
+	        }
+	}	
     }