crypto: x86/poly1305 - Use TEST %reg,%reg instead of CMP $0,%reg

CMP $0,%reg can't set overflow flag, so we can use shorter TEST %reg,%reg
instruction when only zero and sign flags are checked (E,L,LE,G,GE conditions).

Signed-off-by: Uros Bizjak <[e-mail]>
Cc: Herbert Xu <[e-mail]>
Cc: Borislav Petkov <[e-mail]>
Cc: "H. Peter Anvin" <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

arch/x86/crypto/poly1305-x86_64-cryptogams.pl

···
 	mov	%rax,8($ctx)
 	mov	%rax,16($ctx)
 
-	cmp	\$0,$inp
+	test	$inp,$inp
 	je	.Lno_key
 ___
 $code.=<<___ if (!$kernel);