[xen staging] x86/PV: drop "vcpu" local variable from show_guest_stack()

[patchbot@xxxxxxx]

commit 95d1511fe0a3e603e2604574da65d2eb8c541baf
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Wed Nov 24 11:01:05 2021 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Nov 24 11:01:05 2021 +0100

    x86/PV: drop "vcpu" local variable from show_guest_stack()
    
    It's not really needed and has been misleading me more than once to try
    and spot its "actual" use(s). It should really have been dropped when
    the 32-bit specific logic was purged from here.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
 xen/arch/x86/traps.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/xen/arch/x86/traps.c b/xen/arch/x86/traps.c
index d483aa91f2..84c9d9686a 100644
--- a/xen/arch/x86/traps.c
+++ b/xen/arch/x86/traps.c
@@ -327,16 +327,13 @@ static void show_guest_stack(struct vcpu *v, const struct 
cpu_user_regs *regs)
 
     if ( v != current )
     {
-        struct vcpu *vcpu;
-
         if ( !guest_kernel_mode(v, regs) )
         {
             printk("User mode stack\n");
             return;
         }
 
-        vcpu = maddr_get_owner(read_cr3()) == v->domain ? v : NULL;
-        if ( !vcpu )
+        if ( maddr_get_owner(read_cr3()) != v->domain )
         {
             stack_page = stack = do_page_walk(v, (unsigned long)stack);
             if ( (unsigned long)stack < PAGE_SIZE )
--
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