sunrpc: use per-net counts in svc_seq_show()

Update svc_seq_show() to read from the per-netns
statp->vs_count[] arrays instead of the global
svc_version->vs_count[].

The only caller is nfsd, which always allocates vs_count via
svc_stat_alloc_counts() in nfsd_net_init(), so the per-netns
arrays are always available.

This makes /proc/net/rpc/nfsd report per-network-namespace
procedure call counts.

Assisted-by: LLM
Signed-off-by: Jeff Layton <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Chuck Lever <[email protected]>

net/sunrpc/stats.c

@@ -108,7 +108,7 @@ void svc_seq_show(struct seq_file *seq, const struct svc_stat *statp)
 		for (j = 0; j < vers->vs_nproc; j++) {
 			count = 0;
 			for_each_possible_cpu(k)
-				count += per_cpu(vers->vs_count[j], k);
+				count += per_cpu(statp->vs_count[i][j], k);
 			seq_printf(seq, " %lu", count);
 		}
 		seq_putc(seq, '\n');