remove incorrect check_disk() declaration

git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@268 f882894a-f735-0410-b71e-b25c423dba1c

plugins/check_mysql.c

@@ -32,7 +32,6 @@ unsigned int db_port = MYSQL_PORT;
 
 int process_arguments (int, char **);
 int validate_arguments (void);
-int check_disk (int usp, int free_disk);
 void print_help (void);
 void print_usage (void);