x86/delay: Fix inconsistent whitespace

Smatch warns about this whitespace damage:

	arch/x86/lib/delay.c:134 delay_halt_mwaitx() warn: inconsistent indenting

Signed-off-by: Charles Han <hanchunchao@inspur.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20250305063515.3951-1-hanchunchao@inspur.com