doc-rst: extended-controls: "count" is a constant
Constify the string "count" where it means a field. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
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@ -61,7 +61,7 @@ relating to MPEG encoding, etc.
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All controls in the control array must belong to the specified control
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class. An error is returned if this is not the case.
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It is also possible to use an empty control array (count == 0) to check
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It is also possible to use an empty control array (``count`` == 0) to check
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whether the specified control class is supported.
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The control array is a struct
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