Skip empty stdin

src/main.zig

@@ -107,6 +107,10 @@ pub fn main(init: std.process.Init) !void {
             var stdin = &limited.interface;
 
             while (stdin.fillMore()) {
+                // Sometimes fillMore will return 0 bytes.
+                // Skip these
+                if (stdin.seek == stdin.end) continue;
+
                 chunk_writer.end = 0;
                 try chunk_writer.print("{b64}", .{stdin.buffered()});
                 try client.sendRelay(init.io, chunk_writer.buffered(), parseDest(flags.dest));