KVM: arm64: Delete duplicated label in invalid_vector

SYM_CODE_START defines \label , so it is redundant to define \label again.
A redefinition at the same place is accepted by GNU as
(https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=159fbb6088f17a341bcaaac960623cab881b4981)
but rejected by the clang integrated assembler.

Fixes: 617a2f3 ("arm64: kvm: Annotate assembly using modern annoations")
Signed-off-by: Fangrui Song <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Tested-by: Nick Desaulniers <[email protected]>
Reviewed-by: Nick Desaulniers <[email protected]>
Link: ClangBuiltLinux#988
Link: https://lore.kernel.org/r/[email protected]

Author: MaskRay

arch/arm64/kvm/hyp/hyp-entry.S

@@ -198,7 +198,6 @@ SYM_CODE_END(__hyp_panic)
 .macro invalid_vector	label, target = __hyp_panic
 	.align	2
 SYM_CODE_START(\label)
-\label:
 	b \target
 SYM_CODE_END(\label)
 .endm