net/bridge: fix trivial sparse errors

net/bridge//br_stp_if.c:148:66: warning: conversion of
net/bridge//br_stp_if.c:148:66:     int to
net/bridge//br_stp_if.c:148:66:     int enum umh_wait

net/bridge//netfilter/ebtables.c:1150:30: warning: Using plain integer as NULL pointer
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/bridge/br_stp_if.c

@@ -145,7 +145,7 @@ static void br_stp_stop(struct net_bridge *br)
 	char *envp[] = { NULL };
 
 	if (br->stp_enabled == BR_USER_STP) {
-		r = call_usermodehelper(BR_STP_PROG, argv, envp, 1);
+		r = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC);
 		br_info(br, "userspace STP stopped, return code %d\n", r);
 
 		/* To start timers on any ports left in blocking */

net/bridge/netfilter/ebtables.c

@@ -1147,7 +1147,7 @@ ebt_register_table(struct net *net, const struct ebt_table *input_table)
 	void *p;
 
 	if (input_table == NULL || (repl = input_table->table) == NULL ||
-	    repl->entries == 0 || repl->entries_size == 0 ||
+	    repl->entries == NULL || repl->entries_size == 0 ||
 	    repl->counters != NULL || input_table->private != NULL) {
 		BUGPRINT("Bad table data for ebt_register_table!!!\n");
 		return ERR_PTR(-EINVAL);