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[lib/c] Remove unused variable in setvbuf

--- a/lib/c/setvbuf.c

+++ b/lib/c/setvbuf.c

@@ -8,7 +8,7 @@

 int

 setvbuf(FILE * restrict fp, char * restrict buf, int mode, size_t size)

 {

-	int flags, r;

+	int flags;

 	if (_flsbuf(fp) == EOF)

 		return EOF;