check_if()'s errors don't point to the offending part of the
expression.  For instance:
    tests/qapi-schema/alternate-branch-if-invalid.json:2: 'if' condition ' ' makes no sense
Other check_FOO() do, with the help of a @source argument.  Make
check_if() do that, too.  The example above improves to:
    tests/qapi-schema/alternate-branch-if-invalid.json:2: 'if' condition ' ' of 'data' member 'branch' makes no sense
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20190927134639.4284-23-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
		
	
			
		
			
				
	
	
		
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tests/qapi-schema/enum-if-invalid.json: In enum 'TestIfEnum':
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tests/qapi-schema/enum-if-invalid.json:2: 'if' condition of 'data' member 'bar' must be a string or a list of strings
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