Remove an unnecessary comparison.

storage/innobase/fil/fil0crypt.cc

@@ -283,11 +283,6 @@ fil_space_read_crypt_data(
 	const byte*	page,	/*!< in: page 0 */
 	ulint		offset)	/*!< in: offset */
 {
-	if (memcmp(page + offset, EMPTY_PATTERN, MAGIC_SZ) == 0) {
-		/* Crypt data is not stored. */
-		return NULL;
-	}
-
 	if (memcmp(page + offset, CRYPT_MAGIC, MAGIC_SZ) != 0) {
 		/* Crypt data is not stored. */
 		return NULL;

storage/innobase/include/fil0crypt.h

@@ -34,9 +34,6 @@ Created 04/01/2015 Jan Lindström
 static const unsigned char CRYPT_MAGIC[MAGIC_SZ] = {
 	's', 0xE, 0xC, 'R', 'E', 't' };
 
-static const unsigned char EMPTY_PATTERN[MAGIC_SZ] = {
-	0x0, 0x0, 0x0, 0x0, 0x0, 0x0 };
-
 /* This key will be used if nothing else is given */
 #define FIL_DEFAULT_ENCRYPTION_KEY ENCRYPTION_KEY_SYSTEM_DATA
 

storage/xtradb/fil/fil0crypt.cc

@@ -283,11 +283,6 @@ fil_space_read_crypt_data(
 	const byte*	page,	/*!< in: page 0 */
 	ulint		offset)	/*!< in: offset */
 {
-	if (memcmp(page + offset, EMPTY_PATTERN, MAGIC_SZ) == 0) {
-		/* Crypt data is not stored. */
-		return NULL;
-	}
-
 	if (memcmp(page + offset, CRYPT_MAGIC, MAGIC_SZ) != 0) {
 		/* Crypt data is not stored. */
 		return NULL;

storage/xtradb/include/fil0crypt.h

@@ -34,9 +34,6 @@ Created 04/01/2015 Jan Lindström
 static const unsigned char CRYPT_MAGIC[MAGIC_SZ] = {
 	's', 0xE, 0xC, 'R', 'E', 't' };
 
-static const unsigned char EMPTY_PATTERN[MAGIC_SZ] = {
-	0x0, 0x0, 0x0, 0x0, 0x0, 0x0 };
-
 /* This key will be used if nothing else is given */
 #define FIL_DEFAULT_ENCRYPTION_KEY ENCRYPTION_KEY_SYSTEM_DATA