Fix compile error.

cmake/dtrace.cmake

@@ -42,7 +42,7 @@ MACRO(CHECK_DTRACE)
  # On FreeBSD, dtrace does not handle userland tracing yet
  IF(DTRACE AND NOT CMAKE_SYSTEM_NAME MATCHES "FreeBSD"
      AND NOT BUGGY_GCC_NO_DTRACE_MODULES
-     AND NOT BUGGY_LINUX_DTRACE) 
+     AND NOT BUGGY_LINUX_DTRACE
      AND NOT SYSTEM_NAME MATCHES "SunOS")
    SET(ENABLE_DTRACE ON CACHE BOOL "Enable dtrace")
  ENDIF()