Blame SOURCES/festival-gcc7.patch

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diff -up festival/speech_tools/siod/siod.cc.me festival/speech_tools/siod/siod.cc
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--- festival/speech_tools/siod/siod.cc.me	2018-01-31 11:15:01.148463177 +0100
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+++ festival/speech_tools/siod/siod.cc	2018-01-31 11:25:15.737355203 +0100
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@@ -459,7 +459,7 @@ char **siod_variable_generator(char *tex
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     matches = walloc(char *,siod_llength(lmatches)+1);
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     for (l=lmatches,i=0; l; l=cdr(l),i++)
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 	matches[i] = wstrdup(PNAME(car(l)));
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-    matches[i] = '\0';
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+    matches[i] = NULL;
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     return matches;
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 }
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@@ -498,7 +498,7 @@ char **siod_command_generator (char *tex
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     matches = walloc(char *,siod_llength(lmatches)+1);
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     for (l=lmatches,i=0; l; l=cdr(l),i++)
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 	matches[i] = wstrdup(PNAME(car(l)));
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-    matches[i] = '\0';
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+    matches[i] = NULL;
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     return matches;
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 }