add-ons/print/transports/ipp: fix overrunning write

sscanf() requires 1024 bytes for url[] at line 96 and 97,
but url[] size is 256 bytes.

Pointed out by LGTM.

Change-Id: Ia94661b8d7f08874395f8912b48774dba3b9ece2
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5534
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>

src/add-ons/print/transports/ipp/Ipp.cpp

@@ -85,7 +85,7 @@ IPPPrinterRoster::Listen()
 	BNetAddress srcAddress;
 	uint32 type, state;
 	char packet[1541];
-	char uri[256];
+	char uri[1024];
 	char* pos;
 	int32 len;