Blame SOURCES/rpm-4.12.x-rpmSign-return-value-correction.patch

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--- rpm-4.11.3/sign/rpmgensig.c.old	2014-09-05 13:49:16.000000000 +0200
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+++ rpm-4.11.3/sign/rpmgensig.c	2018-05-03 10:58:37.104522827 +0200
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@@ -506,6 +506,7 @@
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 	    }
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 	    goto exit;
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 	}
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+	res = -1;
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     }
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     /* Reallocate the signature into one contiguous region. */