ftrace/x86: Fix order of warning messages when ftrace modifies code

The colon at the end of the printk message suggests that it should get printed
before the details printed by ftrace_bug().

When touching the line, let's use the preferred pr_warn() macro as suggested
by checkpatch.pl.

Link: http://lkml.kernel.org/r/1392650573-3390-5-git-send-email-pmladek@suse.cz



Signed-off-by: Petr Mladek <pmladek@suse.cz>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>