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Fix return annotation of lsx_find_file_extension()

This function may return null.

--- a/src/sox.h

+++ b/src/sox.h

@@ -2450,7 +2450,7 @@

 @returns the file extension, not including the '.', or null if filename does

 not have an extension.

 */

-LSX_RETURN_VALID_Z LSX_RETURN_PURE

+LSX_RETURN_OPT LSX_RETURN_PURE

 char const *

 LSX_API

 lsx_find_file_extension(