Bug #9072 'Max_error_count' system variable cannot be set to zero

Description:
Even if we set the value of 'Max_error_count' system variable to zero, the effective value for the variable is returned as '1'.

How to repeat:
Repro Steps : 	

1. Connect to the MySQL server as 'root'

2. Set the 'Max_error_count' to zero as follows:
	SET @@Max_error_count=0;
	
3. Check for the value set for 'Max_error_count'as follows:
	SELECT @@Max_error_count;
			
Expected Results :  The value returned for 'Max_error_count' should be '0'
		
Actual Results :    The value returned for 'Max_error_count' is set to '1'

Additional Info:  From the refrence manual: To disable warnings, set max_error_count to 0. In this case, warning_count still indicates how many warnings have occurred, but none of the messages are stored. Thus, 'max_error_count' should be allowed to be set to zero.

A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

  http://lists.mysql.com/internals/23223

Coe updated according to manual

Noted in 4.1.11, 5.0.4 changelogs.