target-i386/cpu.c: Coding style fixes

 * Add braces to 'if' statements;
 * Remove last TAB character from the source.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
[AF: Changed whitespace]
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>