rivertile: add missing `try` to fix build

 rivertile/main.zig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/rivertile/main.zig b/rivertile/main.zig
index 780b78c..3dcd6ba 100644
--- a/rivertile/main.zig
+++ b/rivertile/main.zig
@@ -288,7 +288,7 @@ pub fn main() !void {
     }).parse(argv[1..]);
 
     if (args.boolFlag("-h") or args.boolFlag("--help")) {
-        std.io.getStdOut().writeAll(usage);
+        try std.io.getStdOut().writeAll(usage);
         std.os.exit(0);
     }
     if (args.argFlag("-view-padding")) |raw| {