net: fill in MODULE_DESCRIPTION()s for Sun RPC

W=1 builds now warn if module is built without a MODULE_DESCRIPTION().
Add descriptions to Sun RPC modules.

Signed-off-by: Breno Leitao <[e-mail]>
Reviewed-by: Jeff Layton <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

net/sunrpc/auth_gss/auth_gss.c

···
 }
 
 MODULE_ALIAS("rpc-auth-6");
+MODULE_DESCRIPTION("Sun RPC Kerberos RPCSEC_GSS client authentication");
 MODULE_LICENSE("GPL");
 module_param_named(expired_cred_retry_delay,
 		   gss_expired_cred_retry_delay,

net/sunrpc/auth_gss/gss_krb5_mech.c

···
 	gss_mech_unregister(&gss_kerberos_mech);
 }
 
+MODULE_DESCRIPTION("Sun RPC Kerberos 5 module");
 MODULE_LICENSE("GPL");
 module_init(init_kerberos_module);
 module_exit(cleanup_kerberos_module);

net/sunrpc/sunrpc_syms.c

···
 #endif
 	rcu_barrier(); /* Wait for completion of call_rcu()'s */
 }
+MODULE_DESCRIPTION("Sun RPC core");
 MODULE_LICENSE("GPL");
 fs_initcall(init_sunrpc); /* Ensure we're initialised before nfs */
 module_exit(cleanup_sunrpc);