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>

examples/tracing/urandomread-explicit.py

@@ -33,7 +33,7 @@ struct urandom_read_args {
 int printarg(struct urandom_read_args *args) {
     bpf_trace_printk("%d\\n", args->got_bits);
     return 0;
-};
+}
 """
 
 # load BPF program

examples/tracing/urandomread.py

@@ -20,7 +20,7 @@ TRACEPOINT_PROBE(random, urandom_read) {
     // args is from /sys/kernel/debug/tracing/events/random/urandom_read/format
     bpf_trace_printk("%d\\n", args->got_bits);
     return 0;
-};
+}
 """)
 
 # header