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Return failure for file handlers that don't support seeking.

--- a/src/misc.c

+++ b/src/misc.c

@@ -304,7 +304,7 @@

 /* dummy format routines for do-nothing functions */

 int st_format_nothing(ft_t ft) { return(ST_SUCCESS); }

 st_ssize_t st_format_nothing_io(ft_t ft, st_sample_t *buf, st_ssize_t len) { return(0); }

-int st_format_nothing_seek(ft_t ft, st_size_t offset) { return(ST_SUCCESS); }

+int st_format_nothing_seek(ft_t ft, st_size_t offset) { st_fail_errno(ft, ST_ENOTSUP, "operation not supported"); return(ST_EOF); }

 /* dummy effect routine for do-nothing functions */

 int st_effect_nothing(eff_t effp) { return(ST_SUCCESS); }