block/042: check sysfs values prior to running

In testing some older kernels recently, block/042 has failed due
to dma_alignment and virt_boundary_mask not being present.

   Running block/042
   +cat: '.../queue/dma_alignment': No such file or directory
   +cat: '.../queue/virt_boundary_mask': No such file or directory
   +dio-offsets: test_dma_aligned: failed to write buf: Invalid argument

To ensure we skip if this is the case, check all sysfs values prior
to run. Also, change the spaces to tabs before _require_test_dev_sysfs
for consistency with the rest of blktests.

Signed-off-by: John Pittman <[email protected]>
Signed-off-by: Shin'ichiro Kawasaki <[email protected]>

Author: jtpittman195

tests/block/042

@@ -11,7 +11,9 @@ DESCRIPTION="Test unusual direct-io offsets"
 QUICK=1
 
 device_requires() {
-        _require_test_dev_sysfs
+	_require_test_dev_sysfs "queue/max_segments" "queue/dma_alignment" \
+		"queue/virt_boundary_mask" "queue/logical_block_size" \
+		"queue/max_sectors_kb"
 }
 
 test_device() {