Fix mysqltest printing of include stack.

The printing of include stack in the error case in mysqltest omitted the
bottom of the stack (the line number in original test case file), and instead
printed the top of the stack twice. Fix to print each element on the stack
once and only once.

client/mysqltest.cc

@@ -1270,12 +1270,17 @@ static void cleanup_and_exit(int exit_code)
 
 void print_file_stack()
 {
-  for (struct st_test_file* err_file= cur_file;
-       err_file != file_stack;
-       err_file--)
+  struct st_test_file* err_file= cur_file;
+  if (err_file == file_stack)
+    return;
+
+  for (;;)
   {
+    err_file--;
     fprintf(stderr, "included from %s at line %d:\n",
             err_file->file_name, err_file->lineno);
+    if (err_file == file_stack)
+      break;
   }
 }
 

mysql-test/r/mysqltest.result

@@ -334,10 +334,10 @@ included from MYSQLTEST_VARDIR/tmp/recursive.sql at line 1:
 included from MYSQLTEST_VARDIR/tmp/recursive.sql at line 1:
 included from MYSQLTEST_VARDIR/tmp/recursive.sql at line 1:
 included from MYSQLTEST_VARDIR/tmp/recursive.sql at line 1:
-included from MYSQLTEST_VARDIR/tmp/recursive.sql at line 1:
+included from <stdin> at line 1:
 At line 1: Source directives are nesting too deep
 mysqltest: In included file "MYSQLTEST_VARDIR/tmp/error.sql": 
-included from MYSQLTEST_VARDIR/tmp/error.sql at line 1:
+included from <stdin> at line 1:
 At line 1: query 'garbage ' failed: 1064: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'garbage' at line 1
 
 2 = outer loop variable after while
@@ -433,7 +433,7 @@ while with string, only once
 1
 Testing while with not
 mysqltest: In included file "MYSQLTEST_VARDIR/tmp/mysqltest_while.inc": 
-included from MYSQLTEST_VARDIR/tmp/mysqltest_while.inc at line 65:
+included from <stdin> at line 1:
 At line 64: Nesting too deeply
 mysqltest: At line 1: missing '(' in while
 mysqltest: At line 1: missing ')' in while
@@ -484,10 +484,10 @@ mysqltest: At line 1: Illegal argument for port: 'illegal_port'
 mysqltest: At line 1: Illegal option to connect: SMTP
 200 connects succeeded
 mysqltest: In included file "MYSQLTEST_VARDIR/tmp/mysqltest.sql": 
-included from MYSQLTEST_VARDIR/tmp/mysqltest.sql at line 3:
+included from <stdin> at line 1:
 At line 3: connection 'test_con1' not found in connection pool
 mysqltest: In included file "MYSQLTEST_VARDIR/tmp/mysqltest.sql": 
-included from MYSQLTEST_VARDIR/tmp/mysqltest.sql at line 2:
+included from <stdin> at line 1:
 At line 2: Connection test_con1 already exists
 show tables;
 ERROR 3D000: No database selected