qcow2_helper: Fix bound array warning

This fix a warning about a mismatch between
QCOW2_HEADER_SIZE and the size of qcow2_header structure.

Signed-off-by: Anthoine Bourgeois <anthoine.bourgeois@vates.tech>

Author: AnthoineB

qcow2/qcow_helper.h

@@ -37,12 +37,6 @@ struct qcow2_header {
 
     uint32_t refcount_order;
     uint32_t header_length;
-
-    /* Additional fields */
-    uint8_t compression_type;
-
-    /* header must be a multiple of 8 */
-    uint8_t padding[7];
 } __attribute__((packed));
 
 #define SWAP_BE_TO_LE(size, x) \