x86/srso: Remove unnecessary semicolon

scripts/coccinelle/misc/semicolon.cocci reports:

  arch/x86/kernel/cpu/bugs.c:713:2-3: Unneeded semicolon

Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230810010550.25733-1-yang.lee@linux.alibaba.com