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[libc] Match standard prototype for putchar()
Reported-by: Bernhard M. Wiedemann <bwiedemann@suse.de> Signed-off-by: Michael Brown <mcb30@ipxe.org>
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@@ -6,7 +6,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <stdint.h>
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#include <stdarg.h>
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extern void putchar ( int character );
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extern int putchar ( int character );
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extern int getchar ( void );
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