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diff -up patchutils-0.3.4/src/filterdiff.c.format-str patchutils-0.3.4/src/filterdiff.c
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--- patchutils-0.3.4/src/filterdiff.c.format-str	2017-05-15 11:54:20.203918650 +0100
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+++ patchutils-0.3.4/src/filterdiff.c	2017-05-15 11:54:58.631833806 +0100
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@@ -1355,7 +1355,7 @@ read_regex_file (const char *file)
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 			char errstr[300];
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 			regerror (err, &regex[num_regex - 1], errstr,
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 				  sizeof (errstr));
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-			error (EXIT_FAILURE, 0, errstr);
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+			error (EXIT_FAILURE, 0, "%s", errstr);
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 			exit (1);
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 		}
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 	}
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@@ -1613,7 +1613,7 @@ int main (int argc, char *argv[])
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 			char errstr[300];
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 			regerror (err, &regex[num_regex - 1], errstr,
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 				  sizeof (errstr));
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-			error (EXIT_FAILURE, 0, errstr);
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+			error (EXIT_FAILURE, 0, "%s", errstr);
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 			exit (1);
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 		}
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 	}