Ignore comments in rgb.txt. re #76951

--- giftrans-1.12.2.orig/giftrans.c
+++ giftrans-1.12.2/giftrans.c
@@ -811,10 +813,12 @@
 
 	image=argv[0];
 	root=NULL;
-	if (*rgb)
+	if (*rgb) {
 		if ((src=fopen(rgb,"r"))!=NULL) {
 			next= &root;
 			while (fgets(line,sizeof(line),src)) {
+				if (line[0] == '!')
+					continue;
 				*next=(struct entry *)malloc(sizeof(struct entry));
 				for (ptr=line;strchr(" \t",*ptr);ptr++);
 				for (nptr=ptr;!strchr(" \t",*ptr);ptr++);
@@ -847,7 +851,7 @@
 			*rgb='\0';
 #endif
 		}
-
+	}
 	bc.index=NONE;
 	tc.index=NONE;
 	tn.index=NONE;