staging: comedi: jr3_pci: separate out block type

`struct jr3_t` contains a single array member `block` of a tag-less
`struct` type.  Rename the tag-less `struct` type to `struct jr3_block`
and move its definition outside of `struct jr3_t`.  This will allow us
to use pointers of this type.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/jr3_pci.h

@@ -724,13 +724,15 @@ struct jr3_sensor {
 	struct intern_transform transforms[0x10];	/* offset 0x0200 */
 };
 
+struct jr3_block {
+	u32 program_lo[0x4000];		/*  0x00000 - 0x10000 */
+	struct jr3_sensor sensor;	/*  0x10000 - 0x10c00 */
+	char pad2[0x30000 - 0x00c00];	/*  0x10c00 - 0x40000 */
+	u32 program_hi[0x8000];		/*  0x40000 - 0x60000 */
+	u32 reset;			/*  0x60000 - 0x60004 */
+	char pad3[0x20000 - 0x00004];	/*  0x60004 - 0x80000 */
+};
+
 struct jr3_t {
-	struct {
-		u32 program_lo[0x4000];		/*  0x00000 - 0x10000 */
-		struct jr3_sensor sensor;	/*  0x10000 - 0x10c00 */
-		char pad2[0x30000 - 0x00c00];	/*  0x10c00 - 0x40000 */
-		u32 program_hi[0x8000];		/*  0x40000 - 0x60000 */
-		u32 reset;			/*  0x60000 - 0x60004 */
-		char pad3[0x20000 - 0x00004];	/*  0x60004 - 0x80000 */
-	} block[4];
+	struct jr3_block block[4];
 };