git-format-patch: do not crash with format.headers without value.
An incorrect config file can say: [format] headers and crash the parsing. Signed-off-by: Junio C Hamano <junkio@cox.net>
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		@ -202,7 +202,11 @@ static const char *fmt_patch_suffix = ".txt";
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static int git_format_config(const char *var, const char *value)
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{
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	if (!strcmp(var, "format.headers")) {
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		int len = strlen(value);
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		int len;
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		if (!value)
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			die("format.headers without value");
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		len = strlen(value);
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		extra_headers_size += len + 1;
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		extra_headers = xrealloc(extra_headers, extra_headers_size);
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		extra_headers[extra_headers_size - len - 1] = 0;
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