gpu/drm/radeon: Clean up errors in evergreen.c

Fix the following errors reported by checkpatch:

ERROR: space prohibited after that open parenthesis '('
ERROR: space prohibited before that close parenthesis ')'
Signed-off-by: GuoHua Chen <chenguohua_716@163.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/r300_reg.h

@@ -825,7 +825,7 @@
 #	define R300_TX_MIN_FILTER_ANISO_LINEAR              (0 << 13)
 #	define R300_TX_MIN_FILTER_ANISO_NEAREST_MIP_NEAREST (1 << 13)
 #	define R300_TX_MIN_FILTER_ANISO_NEAREST_MIP_LINEAR  (2 << 13)
-#       define R300_TX_MIN_FILTER_MASK   ( (15 << 11) | (3 << 13) )
+#       define R300_TX_MIN_FILTER_MASK   ((15 << 11) | (3 << 13))
 #	define R300_TX_MAX_ANISO_1_TO_1  (0 << 21)
 #	define R300_TX_MAX_ANISO_2_TO_1  (2 << 21)
 #	define R300_TX_MAX_ANISO_4_TO_1  (4 << 21)