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Fix a NULL dereference crash on incorreclty loaded
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FITS images.
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Lubomir Rintel <lkundrak@v3.sk>
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diff -urp siril-0.8/src/callbacks.c siril-0.8.fixed/src/callbacks.c
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--- siril-0.8/src/callbacks.c	2006-05-27 18:58:50.000000000 +0200
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+++ siril-0.8.fixed/src/callbacks.c	2009-04-07 15:51:05.994372980 +0200
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@@ -604,6 +604,9 @@ gboolean redraw(int vport, int doremap){
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 		case RED_VPORT:
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 		case BLUE_VPORT:
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 		case GREEN_VPORT:
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+			if (!com.graybuf[vport])
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+				break;
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+
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 			if (doremap==REMAP){
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 				if(gfit.naxis==3){
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 					remap(RED_VPORT);