MIPS: IP checksums: Remove unncessary folding of sum to 16 bit.

Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/lib/csum_partial.S

@@ -276,11 +276,6 @@ LEAF(csum_partial)
 	dsra32	sum, sum, 0
 	addu	sum, v1
 #endif
-	sll	v1, sum, 16
-	addu	sum, v1
-	sltu	v1, sum, v1
-	srl	sum, sum, 16
-	addu	sum, v1
 
 	/* odd buffer alignment? */
 	beqz	t7, 1f
@@ -678,11 +673,6 @@ EXC(	sb	t0, NBYTES-2(dst), .Ls_exc)
 	dsra32	sum, sum, 0
 	addu	sum, v1
 #endif
-	sll	v1, sum, 16
-	addu	sum, v1
-	sltu	v1, sum, v1
-	srl	sum, sum, 16
-	addu	sum, v1
 
 	/* odd buffer alignment? */
 	beqz	odd, 1f