sparc64: fix unused variable warning

   arch/sparc/mm/init_64.c: In function 'arch_hugetlb_valid_size':
   arch/sparc/mm/init_64.c:361:24: warning: variable 'hv_pgsz_idx'
     set but not used [-Wunused-but-set-variable]
     361 |         unsigned short hv_pgsz_idx;
         |                        ^~~~~~~~~~~

Reported-by: kernel test robot <lkp@intel.com>
Cc: sparclinux@vger.kernel.org
CC: Nitin Gupta <nitin.m.gupta@oracle.com>
Cc: Andreas Larsson <andreas@gaisler.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Alex Shi <alexs@kernel.org>
Reviewed-by: Andreas Larsson <andreas@gaisler.com>
Signed-off-by: Andreas Larsson <andreas@gaisler.com>

Author: Alex Shi

arch/sparc/mm/init_64.c

@@ -358,30 +358,24 @@ static void __init pud_huge_patch(void)
 bool __init arch_hugetlb_valid_size(unsigned long size)
 {
 	unsigned int hugepage_shift = ilog2(size);
-	unsigned short hv_pgsz_idx;
 	unsigned int hv_pgsz_mask;
 
 	switch (hugepage_shift) {
 	case HPAGE_16GB_SHIFT:
 		hv_pgsz_mask = HV_PGSZ_MASK_16GB;
-		hv_pgsz_idx = HV_PGSZ_IDX_16GB;
 		pud_huge_patch();
 		break;
 	case HPAGE_2GB_SHIFT:
 		hv_pgsz_mask = HV_PGSZ_MASK_2GB;
-		hv_pgsz_idx = HV_PGSZ_IDX_2GB;
 		break;
 	case HPAGE_256MB_SHIFT:
 		hv_pgsz_mask = HV_PGSZ_MASK_256MB;
-		hv_pgsz_idx = HV_PGSZ_IDX_256MB;
 		break;
 	case HPAGE_SHIFT:
 		hv_pgsz_mask = HV_PGSZ_MASK_4MB;
-		hv_pgsz_idx = HV_PGSZ_IDX_4MB;
 		break;
 	case HPAGE_64K_SHIFT:
 		hv_pgsz_mask = HV_PGSZ_MASK_64K;
-		hv_pgsz_idx = HV_PGSZ_IDX_64K;
 		break;
 	default:
 		hv_pgsz_mask = 0;