um: Remove straying parenthesis

Commit e3a33af8 ("um: fix and optimize xor select template for CONFIG64 and timetravel mode")
caused a build regression when CONFIG_XOR_BLOCKS and CONFIG_UML_TIME_TRAVEL_SUPPORT
are selected.
Fix it by removing the straying parenthesis.

Cc: stable@vger.kernel.org
Fixes: e3a33af8 ("um: fix and optimize xor select template for CONFIG64 and timetravel mode")
Signed-off-by: Benjamin Beichler <benjamin.beichler@uni-rostock.de>
[rw: Added commit message]
Signed-off-by: Richard Weinberger <richard@nod.at>

arch/um/include/asm/xor.h

@@ -18,7 +18,7 @@
 #undef XOR_SELECT_TEMPLATE
 /* pick an arbitrary one - measuring isn't possible with inf-cpu */
 #define XOR_SELECT_TEMPLATE(x)	\
-	(time_travel_mode == TT_MODE_INFCPU ? TT_CPU_INF_XOR_DEFAULT : x))
+	(time_travel_mode == TT_MODE_INFCPU ? TT_CPU_INF_XOR_DEFAULT : x)
 #endif
 
 #endif