x86/spectre: Fix spelling mistake: "vunerable"-> "vulnerable"

x86/spectre: Fix spelling mistake: "vunerable"-> "vulnerable"

Trivial fix to spelling mistake in pr_err error message text.

Signed-off-by: Colin Ian King <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: [email protected]
Cc: Andy Lutomirski <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: David Woodhouse <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]