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webfs: don't handle unknown status codes as continuations, reset status when handling continuation to avoid infinite loop

--- a/sys/src/cmd/webfs/http.c

+++ b/sys/src/cmd/webfs/http.c

@@ -795,12 +795,16 @@

 				i -= (i % 100);

 				goto Status;

 			}

+			goto Error;

 		case 100:	/* Continue */

 		case 101:	/* Switching Protocols */

+		case 102:	/* Processing */

+		case 103:	/* Early Hints */

 			while(k = rhdr){

 				rhdr = k->next;

 				free(k);

 			}

+			strcpy(status, "0 No status");

 			goto Cont;

 		case 304:	/* Not Modified */

 			nobody = 1;