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libauthsrv: preserve readcons() error message from read() error

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

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

@@ -37,8 +37,13 @@

 			s = p, p += n;

 		}

-		if(read(fdin, p, 1) <= 0 || *p == 0x7f)

+		n = read(fdin, p, 1);

+		if(n < 0)

 			break;

+		if(n == 0 || *p == 0x7f){

+			werrstr("input aborted");

+			break;

+		}

 		if(*p == '\n' || *p == '\r'){

 			if(p == s && def != nil){