fix(amzn): Print initial absolute snapshot before polling diffs

The interval polling loop was sleeping before printing anything,
so the user never saw the initial absolute stats. Print the first
snapshot immediately, then use it as the baseline for subsequent
diffs.

Author: awz1234

plugins/amzn/amzn-nvme.c

@@ -630,7 +630,12 @@ static int get_stats(int argc, char **argv, struct command *acmd,
 		printf("Polling NVMe stats every %u sec(s); press Ctrl+C to stop\n\n",
 		       interval);
 
-		/* first snapshot becomes the baseline */
+		/* print the initial absolute snapshot */
+		if (flags & JSON)
+			amzn_print_json_stats(&log, detail);
+		else
+			amzn_print_normal_stats(&log, detail);
+
 		prev = log;
 		amzn_keep_polling = 1;