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libc: Fix check in fflush()

The check was trying to call _flsbuf() only in output streams,
but what it was testing was just the opossite.

--- a/src/libc/stdio/fflush.c

+++ b/src/libc/stdio/fflush.c

@@ -14,7 +14,7 @@

 	err = 0;

 	for (fp = __iob; fp < &__iob[FOPEN_MAX]; ++fp) {

-		if ((fp->flags & _IOWRITE) == 0 && _flsbuf(fp))

+		if ((fp->flags & _IOWRITE) != 0 && _flsbuf(fp))

 			err = EOF;

 	}

 	return err;