fix the encryption.filekeys_nofile test

and move the error reporting where it belongs

mysql-test/suite/encryption/r/filekeys_nofile.result

-call mtr.add_suppression("File '' not found");
+call mtr.add_suppression("file-key-management-filename is not set");
 call mtr.add_suppression("Plugin 'file_key_management' init function returned error");
 call mtr.add_suppression("Plugin 'file_key_management' registration.*failed");
-FOUND /File '' not found/ in mysqld.1.err
+FOUND /file-key-management-filename is not set/ in mysqld.1.err
 create table t1(c1 bigint not null, b char(200))  engine=innodb encrypted=yes encryption_key_id=1;
 ERROR HY000: Can't create table `test`.`t1` (errno: 140 "Wrong create options")
 select plugin_status from information_schema.plugins

mysql-test/suite/encryption/t/filekeys_nofile.test

-let SEARCH_PATTERN=File '' not found;
+let SEARCH_PATTERN=file-key-management-filename is not set;
 source filekeys_badtest.inc;

plugin/file_key_management/file_key_management_plugin.cc

@@ -16,7 +16,6 @@
 
 #include "parser.h"
 #include <mysql/plugin_encryption.h>
-#include <mysqld_error.h>
 #include <string.h>
 
 static char* filename;
@@ -166,13 +165,6 @@ struct st_mariadb_encryption file_key_management_plugin= {
 
 static int file_key_management_plugin_init(void *p)
 {
-  if (!filename || !filename[0])
-  {
-    my_printf_error(ER_CANT_INITIALIZE_UDF,
-                    "file_key_management-filename is not set", MYF(0));
-    return 1;
-  }
-  
   Parser parser(filename, filekey);
   return parser.parse(&keys);
 }

plugin/file_key_management/parser.cc

@@ -298,8 +298,16 @@ int Parser::parse_line(char **line_ptr, keyentry *key)
 
 char* Parser::read_and_decrypt_file(const char *secret)
 {
-  int f= my_open(filename, O_RDONLY, MYF(MY_WME));
-  if (f < 0)
+  if (!filename || !filename[0])
+  {
+    my_printf_error(EE_CANT_OPEN_STREAM,
+                    "file-key-management-filename is not set",
+                    MYF(ME_NOREFRESH));
+    goto err0;
+  }
+
+  int f;
+  if ((f= my_open(filename, O_RDONLY, MYF(MY_WME))) < 0)
     goto err0;
 
   my_off_t file_size;