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printf: handle %%

--- a/libc/printf.c

+++ b/libc/printf.c

@@ -60,6 +60,9 @@

 			print_str("0x");

 			count += print_digit((long)va_arg(ap, unsigned int), 16);

 			break;

+		case '%':

+			print_str("%");

+			count += 1;

 		default:

 			count += print_char(specifier);

 			break;