tools/testing: Fix trailing semicolon

The trailing semicolon is an empty statement that does no operation.
Removing it since it doesn't do anything.

Signed-off-by: Luis de Bethencourt <[e-mail]>
Signed-off-by: Shuah Khan <[e-mail]>

tools/testing/selftests/nsfs/pidns.c

···
 			return pr_err("NS_GET_PARENT returned a wrong namespace");
 
 		if (ioctl(pns, NS_GET_PARENT) >= 0 || errno != EPERM)
-			return pr_err("Don't get EPERM");;
+			return pr_err("Don't get EPERM");
 	}
 
 	kill(pid, SIGKILL);