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libauthsrv: deal with signed char in readcons()

--- a/sys/src/libauthsrv/readcons.c

+++ b/sys/src/libauthsrv/readcons.c

@@ -66,7 +66,7 @@

 				fprint(fdout, "\n%s: ", prompt);

 			while(p > s)

 				*p-- = 0;

-		} else if(*p >= ' ')

+		} else if((*p & 0xff) >= ' ')

 			p++;

 	}

 	free(s);