Merge performance fix for cmsDupToneCurve from previous upstream branch.

core/src/fxcodec/lcms2/lcms2-2.6/src/cmsgamma.c

Index: core/src/fxcodec/lcms2/lcms2-2.6/src/cmsgamma.c
diff --git a/core/src/fxcodec/lcms2/lcms2-2.6/src/cmsgamma.c b/core/src/fxcodec/lcms2/lcms2-2.6/src/cmsgamma.c
index d5aa87b105da0f6f6ce5a96966263e8dd0a825fc..97aeb7cc16c2c00698d0529fdb4c08be9555ff42 100644
--- a/core/src/fxcodec/lcms2/lcms2-2.6/src/cmsgamma.c
+++ b/core/src/fxcodec/lcms2/lcms2-2.6/src/cmsgamma.c
@@ -822,7 +822,7 @@ cmsToneCurve* CMSEXPORT cmsDupToneCurve(const cmsToneCurve* In)
 	// Xiaochuan Liu
 	// fix openpdf bug(mantis id:0055683, google id:360198)
 	// the function CurveSetElemTypeFree in cmslut.c also needs to check pointer
-    if (In == NULL || In ->InterpParams == NULL) return NULL;
+    if (In == NULL || In ->InterpParams == NULL || In ->Segments == NULL || In ->Table16 == NULL) return NULL;

[jun_fang, 2014/09/03 18:52:13]

Seems that these the checking for |In ->Segments == NULL || In -
      >Table16 == NULL| was removed when lcms was upgraded from 2.0 to 2.6. I am
double checking with the author to know its reason.  

 
     return  AllocateToneCurveStruct(In ->InterpParams ->ContextID, In ->nEntries, In ->nSegments, In ->Segments, In ->Table16);
 }