env: Rename setenv() to env_set()

We are now using an env_ prefix for environment functions. Rename setenv()
for consistency. Also add function comments in common.h.

Suggested-by: Wolfgang Denk <wd@denx.de>
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/cmd/net.c b/cmd/net.c
index 5e91d3a..ae8eeb7 100644
--- a/cmd/net.c
+++ b/cmd/net.c
@@ -116,23 +116,23 @@
 
 	if (net_gateway.s_addr) {
 		ip_to_string(net_gateway, tmp);
-		setenv("gatewayip", tmp);
+		env_set("gatewayip", tmp);
 	}
 
 	if (net_netmask.s_addr) {
 		ip_to_string(net_netmask, tmp);
-		setenv("netmask", tmp);
+		env_set("netmask", tmp);
 	}
 
 	if (net_hostname[0])
-		setenv("hostname", net_hostname);
+		env_set("hostname", net_hostname);
 
 	if (net_root_path[0])
-		setenv("rootpath", net_root_path);
+		env_set("rootpath", net_root_path);
 
 	if (net_ip.s_addr) {
 		ip_to_string(net_ip, tmp);
-		setenv("ipaddr", tmp);
+		env_set("ipaddr", tmp);
 	}
 #if !defined(CONFIG_BOOTP_SERVERIP)
 	/*
@@ -141,32 +141,32 @@
 	 */
 	if (net_server_ip.s_addr) {
 		ip_to_string(net_server_ip, tmp);
-		setenv("serverip", tmp);
+		env_set("serverip", tmp);
 	}
 #endif
 	if (net_dns_server.s_addr) {
 		ip_to_string(net_dns_server, tmp);
-		setenv("dnsip", tmp);
+		env_set("dnsip", tmp);
 	}
 #if defined(CONFIG_BOOTP_DNS2)
 	if (net_dns_server2.s_addr) {
 		ip_to_string(net_dns_server2, tmp);
-		setenv("dnsip2", tmp);
+		env_set("dnsip2", tmp);
 	}
 #endif
 	if (net_nis_domain[0])
-		setenv("domain", net_nis_domain);
+		env_set("domain", net_nis_domain);
 
 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 	if (net_ntp_time_offset) {
 		sprintf(tmp, "%d", net_ntp_time_offset);
-		setenv("timeoffset", tmp);
+		env_set("timeoffset", tmp);
 	}
 #endif
 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 	if (net_ntp_server.s_addr) {
 		ip_to_string(net_ntp_server, tmp);
-		setenv("ntpserverip", tmp);
+		env_set("ntpserverip", tmp);
 	}
 #endif
 }
@@ -291,14 +291,14 @@
 		printf("CDP offered appliance VLAN %d\n",
 		       ntohs(cdp_appliance_vlan));
 		vlan_to_string(cdp_appliance_vlan, tmp);
-		setenv("vlan", tmp);
+		env_set("vlan", tmp);
 		net_our_vlan = cdp_appliance_vlan;
 	}
 
 	if (cdp_native_vlan != htons(-1)) {
 		printf("CDP offered native VLAN %d\n", ntohs(cdp_native_vlan));
 		vlan_to_string(cdp_native_vlan, tmp);
-		setenv("nvlan", tmp);
+		env_set("nvlan", tmp);
 		net_native_vlan = cdp_native_vlan;
 	}
 }
@@ -423,14 +423,14 @@
 
 	net_gateway.s_addr = 0;
 	ip_to_string(net_gateway, tmp);
-	setenv("gatewayip", tmp);
+	env_set("gatewayip", tmp);
 
 	ip_to_string(net_netmask, tmp);
-	setenv("netmask", tmp);
+	env_set("netmask", tmp);
 
 	ip_to_string(net_ip, tmp);
-	setenv("ipaddr", tmp);
-	setenv("llipaddr", tmp); /* store this for next time */
+	env_set("ipaddr", tmp);
+	env_set("llipaddr", tmp); /* store this for next time */
 
 	return CMD_RET_SUCCESS;
 }