x86/sev: Remove duplicated assignment to variable info

Variable info is being assigned the same value twice, remove the
redundant assignment. Also assign variable v in the declaration.

Cleans up clang scan warning:
  warning: Value stored to 'info' during its initialization is never read [deadcode.DeadStores]

No code changed:

  # arch/x86/kernel/sev.o:

   text    data     bss     dec     hex filename
  19878    4487    4112   28477    6f3d sev.o.before
  19878    4487    4112   28477    6f3d sev.o.after

md5:
   bfbaa515af818615fd01fea91e7eba1b  sev.o.before.asm
   bfbaa515af818615fd01fea91e7eba1b  sev.o.after.asm

  [ bp: Running the before/after check on sev.c because sev-shared.c
    gets included into it. ]

Fixes: 597cfe4 ("x86/boot/compressed/64: Setup a GHCB-based VC Exception handler")
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20220516184215.51841-1-colin.i.king@gmail.com

Author: ColinIanKing

arch/x86/kernel/sev-shared.c

@@ -201,10 +201,7 @@ static enum es_result verify_exception_info(struct ghcb *ghcb, struct es_em_ctxt
 
 	if (ret == 1) {
 		u64 info = ghcb->save.sw_exit_info_2;
-		unsigned long v;
-
-		info = ghcb->save.sw_exit_info_2;
-		v = info & SVM_EVTINJ_VEC_MASK;
+		unsigned long v = info & SVM_EVTINJ_VEC_MASK;
 
 		/* Check if exception information from hypervisor is sane. */
 		if ((info & SVM_EVTINJ_VALID) &&