KVM: PPC: Remove extra get_page() to fix page refcount leak

Don't manually do get_page() when patching dcbz, as gfn_to_page() gifts
the caller a reference. I.e. doing get_page() will leak the page due to
not putting all references.

Signed-off-by: Sean Christopherson <[e-mail]>
Tested-by: Dmitry Osipenko <[e-mail]>
Signed-off-by: Paolo Bonzini <[e-mail]>
Message-ID: <[e-mail]>

arch/powerpc/kvm/book3s_pr.c

···
 	hpage_offset &= ~0xFFFULL;
 	hpage_offset /= 4;
 
-	get_page(hpage);
 	page = kmap_atomic(hpage);
 
 	/* patch dcbz into reserved instruction, so we trap */