SUNRPC: Use sysfs_emit in place of strlcpy/sprintf

Part of an effort to remove strlcpy() tree-wide [1].

Direct replacement is safe here since the getter in kernel_params_ops
handles -errno return [2].

[1] https://github.com/KSPP/linux/issues/89
[2] https://elixir.bootlin.com/linux/v6.4-rc6/source/include/linux/moduleparam.h#L52Signed-off-by: Azeem Shaikh <azeemshaikh38@gmail.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

net/sunrpc/svc.c

@@ -109,15 +109,15 @@ param_get_pool_mode(char *buf, const struct kernel_param *kp)
 	switch (*ip)
 	{
 	case SVC_POOL_AUTO:
-		return strlcpy(buf, "auto\n", 20);
+		return sysfs_emit(buf, "auto\n");
 	case SVC_POOL_GLOBAL:
-		return strlcpy(buf, "global\n", 20);
+		return sysfs_emit(buf, "global\n");
 	case SVC_POOL_PERCPU:
-		return strlcpy(buf, "percpu\n", 20);
+		return sysfs_emit(buf, "percpu\n");
 	case SVC_POOL_PERNODE:
-		return strlcpy(buf, "pernode\n", 20);
+		return sysfs_emit(buf, "pernode\n");
 	default:
-		return sprintf(buf, "%d\n", *ip);
+		return sysfs_emit(buf, "%d\n", *ip);
 	}
 }