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diff -up cups-1.7b1/cups/ipp.c.va_list cups-1.7b1/cups/ipp.c
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--- cups-1.7b1/cups/ipp.c.va_list	2013-03-14 19:45:49.000000000 +0100
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+++ cups-1.7b1/cups/ipp.c	2013-04-29 15:45:52.680403846 +0200
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@@ -1210,7 +1210,7 @@ ippAddStringfv(ipp_t      *ipp,		/* I -
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       group == IPP_TAG_END || group >= IPP_TAG_UNSUPPORTED_VALUE ||
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       (value_tag < IPP_TAG_TEXT && value_tag != IPP_TAG_TEXTLANG &&
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        value_tag != IPP_TAG_NAMELANG) || value_tag > IPP_TAG_MIMETYPE ||
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-      !format || !ap)
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+      !format)
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     return (NULL);
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   if ((value_tag == IPP_TAG_TEXTLANG || value_tag == IPP_TAG_NAMELANG)
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@@ -4449,7 +4449,7 @@ ippSetStringfv(ipp_t           *ipp,	/*
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   if (!ipp || !attr || !*attr ||
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       (value_tag < IPP_TAG_TEXT && value_tag != IPP_TAG_TEXTLANG &&
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        value_tag != IPP_TAG_NAMELANG) || value_tag > IPP_TAG_MIMETYPE ||
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-      !format || !ap)
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+      !format)
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     return (0);
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  /*