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io: always strdup filename (else a crashe on io-set-filename! of in-memory io)

--- a/src/ios.c

+++ b/src/ios.c

@@ -3,8 +3,6 @@

 #define MOST_OF(x) ((x) - ((x)>>4))

-static char emptystr[] = "";

-

 sl_ios *ios_stdin = nil;

 sl_ios *ios_stdout = nil;

 sl_ios *ios_stderr = nil;

@@ -565,10 +563,8 @@

 void

 ios_free(sl_ios *s)

 {

-	if(s->loc.filename != emptystr){

-		MEM_FREE(s->loc.filename);

-		s->loc.filename = emptystr;

-	}

+	MEM_FREE(s->loc.filename);

+	s->loc.filename = nil;

 }

 static void

@@ -779,7 +775,7 @@

 {

 	_ios_init(s);

 	s->bm = bm_mem;

-	s->loc.filename = emptystr;

+	s->loc.filename = MEM_STRDUP("");

 	_buf_realloc(s, initsize);

 	return s;

 }