block: clarify confusion between 0xFFFFFFFF and ascending patterns

Patterns 0xFFFFFFFF and -1 are the same. This fixes separates the
two by encoding the sequence pattern differently. Providing more
readable code that allows faster debugging.

Change-Id: Ib3ad61452d5e6a75a83b8b1795b11889a7e30208
Signed-off-by: Dolev Raviv <draviv@codeaurora.org>
diff --git a/include/linux/test-iosched.h b/include/linux/test-iosched.h
index 3690160..89d3b30 100644
--- a/include/linux/test-iosched.h
+++ b/include/linux/test-iosched.h
@@ -23,7 +23,7 @@
 /*
  * Patterns definitions for read/write requests data
  */
-#define TEST_PATTERN_SEQUENTIAL	-1
+#define TEST_PATTERN_SEQUENTIAL	0x12345678
 #define TEST_PATTERN_5A		0x5A5A5A5A
 #define TEST_PATTERN_FF		0xFFFFFFFF
 #define TEST_NO_PATTERN		0xDEADBEEF