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auth/acmed: better challenge error reporting.

--- a/sys/src/cmd/auth/acmed.c

+++ b/sys/src/cmd/auth/acmed.c

@@ -570,13 +570,15 @@

 	if((tok = jsonbyname(j, "token")) == nil)

 		return -1;

-	if(ty->t != JSONString || url->t != JSONString || tok->t != JSONString)

+	if(ty->t != JSONString || url->t != JSONString || tok->t != JSONString) {

+		werrstr("invalid challenge");

 		return -1;

+	}

 	if((dn = jsonbyname(id, "value")) == nil)

 		return -1;

 	if(dn->t != JSONString) {

-		werrstr("key 'value' not a string");

+		werrstr("invalid identifier");

 		return -1;

 	}

@@ -684,7 +686,7 @@

 				werrstr("could not complete challenge: %r");

 		}

 		if(!matched)

-			sysfatal("no matching auth type");

+			sysfatal("no matching auth type: %r");

 		jsonfree(chals);

 		free(resp);

 	}