btrfs-progs: fix UNITS_DECIMAL and UNITS_NEGATIVE bit definitions

The values of UNITS_ modes are supposed to be unique and
non-overlapping. Due to wrong definition this was not true for
UNITS_DECIMAL which set 2 bits. This breaks code that strictly depends
on the uniqueness of the bits and not on the order of processing of the
constants.

Signed-off-by: David Sterba <dsterba@suse.com>

Author: kdave

common/units.h

@@ -31,9 +31,9 @@
 #define UNITS_TBYTES			(5)
 #define UNITS_RAW			(1U << UNITS_MODE_SHIFT)
 #define UNITS_BINARY			(2U << UNITS_MODE_SHIFT)
-#define UNITS_DECIMAL			(3U << UNITS_MODE_SHIFT)
+#define UNITS_DECIMAL			(4U << UNITS_MODE_SHIFT)
 /* Interpret the u64 value as s64 */
-#define UNITS_NEGATIVE			(4U << UNITS_MODE_SHIFT)
+#define UNITS_NEGATIVE			(8U << UNITS_MODE_SHIFT)
 #define UNITS_MODE_MASK			((1U << UNITS_MODE_SHIFT) - 1)
 #define UNITS_MODE_SHIFT		(8)
 #define UNITS_HUMAN_BINARY		(UNITS_BINARY)