include: Remove trailing whitespaces

Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

include/xen/arch-x86/xen.h

@@ -1,8 +1,8 @@
 /******************************************************************************
  * arch-x86/xen.h
- * 
+ *
  * Guest OS interface to x86 Xen.
- * 
+ *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to
  * deal in the Software without restriction, including without limitation the
@@ -152,7 +152,7 @@ DEFINE_XEN_GUEST_HANDLE(trap_info_t);
 typedef uint64_t tsc_timestamp_t; /* RDTSC timestamp */
 
 /*
- * The following is all CPU context. Note that the fpu_ctxt block is filled 
+ * The following is all CPU context. Note that the fpu_ctxt block is filled
  * in by FXSAVE if the CPU has feature FXSR; otherwise FSAVE is used.
  *
  * Also note that when calling DOMCTL_setvcpucontext and VCPU_initialise