make :1-1 work (Arvindh Tamilmani)

src/cmd/acme/addr.c

diff --git a/src/cmd/acme/addr.c b/src/cmd/acme/addr.c
index 3869e39..a3c0499 100644
--- a/src/cmd/acme/addr.c
+++ b/src/cmd/acme/addr.c
@@ -98,7 +98,8 @@
 			}
 			--q0;
 		}
-		if(line > 0)
+		/* :1-1 is :0 = #0, but :1-2 is an error */
+		if(line > 1)
 			goto Rescue;
 		while(q0>0 && textreadc(t, q0-1)!='\n')
 			--q0;