Add aaa-12 修改dhcp lib

SOL 修改dhcp lib
修改人：wuqihy
检视人：yinbin

Signed-off-by: wuqihy <wuqihy@cmhi.chinamobile.com>

Platform/user/configm/config-server/dhcp_config/dhcp_lib.c

@@ -42,6 +42,9 @@ int del_interface_dhcp_cb(BR_EVENT_TYPE event_type, br_event_t event_arg)
     if(mask){
         free(mask);
     }
+    if(cmd){
+        free(cmd);
+    }
     /*运行配置文件*/
     system("service isc-dhcp-server restart");
     return ret;
@@ -225,9 +228,11 @@ int file_consist_str(char *fname, char *str){
     while((fgets(line,1000,fp))!=NULL){
         char *p = strstr(line, str);
         if(p){
+           fclose(fp);
            return TRUE; 
         }
     }
+    fclose(fp);
     return FALSE;
 }