urandomread.py: remove extra tail semicolon after TRACEPOINT_PROBE

A function definition doesn't need a tail semicolon.

Signed-off-by: Liu Bo <liub.liubo@gmail.com>
diff --git a/examples/tracing/urandomread.py b/examples/tracing/urandomread.py
index 2f46bda..319db2c 100755
--- a/examples/tracing/urandomread.py
+++ b/examples/tracing/urandomread.py
@@ -20,7 +20,7 @@
     // args is from /sys/kernel/debug/tracing/events/random/urandom_read/format
     bpf_trace_printk("%d\\n", args->got_bits);
     return 0;
-};
+}
 """)
 
 # header