Remove trailing whitespace.

Signed-off-by: Jeff Lait <jlait@andorra.sidefx.com>

Author: jmlait

openvdb/openvdb/math/Half.h

@@ -203,7 +203,7 @@ namespace internal {
 // Use of lookup table is explicitly suppressed and the generation of
 // a lookup table is suppressed.  This is required because we namespace
 // our type, but the lookup table is extern "C" and lacks a namespace.
-// Thus any attempt to link two versions of OpenVDB with different 
+// Thus any attempt to link two versions of OpenVDB with different
 // namespaces will clash due to redefinition with a new type.
 // The default was not to use a lookup table.
 #undef  IMATH_HALF_USE_LOOKUP_TABLE