sparc32: Kill boot_cpu_id4

It is written, but never actually read.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/kernel/head_32.S b/arch/sparc/kernel/head_32.S
index 69645ca..a0ec4ad 100644
--- a/arch/sparc/kernel/head_32.S
+++ b/arch/sparc/kernel/head_32.S
@@ -819,10 +819,7 @@
 		mov	%g0, %g3
 		stub	%g3, [%g2 + %lo(boot_cpu_id)]
 
-1:		/* boot_cpu_id set. calculate boot_cpu_id4 = boot_cpu_id*4 */
-		sll	%g3, 2, %g3
-		sethi	%hi(boot_cpu_id4), %g2
-		stub	%g3, [%g2 + %lo(boot_cpu_id4)]
+1:		sll	%g3, 2, %g3
 
 		/* Initialize the uwinmask value for init task just in case.
 		 * But first make current_set[boot_cpu_id] point to something useful.