Adding d/p/13_check_mysql_fix_variables from upstream

https://patch-diff.githubusercontent.com/raw/monitoring-plugins/monitoring-plugins/pull/2015.diff

debian/patches/13_check_mysql_fix_variables

@@ -0,0 +1,28 @@
+diff --git a/plugins/check_mysql.c b/plugins/check_mysql.c
+index 6a7daf11a..15ec04c04 100644
+--- a/plugins/check_mysql.c
++++ b/plugins/check_mysql.c
+@@ -59,8 +59,8 @@ bool ssl = false;
+ char *opt_file = NULL;
+ char *opt_group = NULL;
+ unsigned int db_port = MYSQL_PORT;
+-int check_slave = 0, warn_sec = 0, crit_sec = 0;
+-int ignore_auth = 0;
++bool check_slave = false;
++bool ignore_auth = false;
+ int verbose = 0;
+ 
+ static double warning_time = 0;
+@@ -456,10 +456,10 @@ process_arguments (int argc, char **argv)
+ 			db_port = atoi (optarg);
+ 			break;
+ 		case 'S':
+-			check_slave = 1;							/* check-slave */
++			check_slave = true;							/* check-slave */
+ 			break;
+ 		case 'n':
+-			ignore_auth = 1;							/* ignore-auth */
++			ignore_auth = true;							/* ignore-auth */
+ 			break;
+ 		case 'w':
+ 			warning = optarg;

debian/patches/series

@@ -4,4 +4,5 @@
 10_check_curl_fix_redirects
 11_check_curl_raise_ssl_issue
 12_check_curl_add_docu
+13_check_mysql_fix_variables
 # feature patches