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From snapshot 6.1-20191012
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diff --git a/progs/dump_entry.c b/progs/dump_entry.c
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index d0e420ec..8a47084a 100644
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--- a/progs/dump_entry.c
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+++ b/progs/dump_entry.c
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@@ -1136,7 +1136,8 @@ fmt_entry(TERMTYPE2 *tterm,
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 				*d++ = '\\';
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 				*d = ':';
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 			    } else if (*d == '\\') {
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-				*++d = *s++;
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+				if ((*++d = *s++) == '\0')
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+				    break;
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 			    }
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 			    d++;
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 			    *d = '\0';