main: fix segfault
Follow-up to commit 5eb2396cd as that wasn't complete.
At times HEADERFUNCTION+HEADERDATA was set only to have only HEADERDATA
set in the subsequent loop which could cause a NULL to get sent as
userdata to 'header_callback' which wasn't made to handle that.
Now HEADERFUNCTION is explicitly set to NULL if it isn't set to the
callback.
			
			
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		| @@ -5415,8 +5415,6 @@ operate(struct Configurable *config, int argc, argv_item_t argv[]) | ||||
|         my_setopt(curl, CURLOPT_QUOTE, config->quote); | ||||
|         my_setopt(curl, CURLOPT_POSTQUOTE, config->postquote); | ||||
|         my_setopt(curl, CURLOPT_PREQUOTE, config->prequote); | ||||
|         my_setopt(curl, CURLOPT_HEADERDATA, | ||||
|                   config->headerfile?&heads:NULL); | ||||
|         my_setopt_str(curl, CURLOPT_COOKIEFILE, config->cookiefile); | ||||
|         /* cookie jar was added in 7.9 */ | ||||
|         if(config->cookiejar) | ||||
| @@ -5621,6 +5619,12 @@ operate(struct Configurable *config, int argc, argv_item_t argv[]) | ||||
|           my_setopt(curl, CURLOPT_HEADERFUNCTION, header_callback); | ||||
|           my_setopt(curl, CURLOPT_HEADERDATA, &outs); | ||||
|         } | ||||
|         else { | ||||
|           /* if HEADERFUNCTION was set to something in the previous loop, it | ||||
|              is important that we set it (back) to NULL now */ | ||||
|           my_setopt(curl, CURLOPT_HEADERFUNCTION, NULL); | ||||
|           my_setopt(curl, CURLOPT_HEADERDATA, config->headerfile?&heads:NULL); | ||||
|         } | ||||
|  | ||||
|         if(config->resolve) | ||||
|           /* new in 7.21.3 */ | ||||
|   | ||||
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	 Daniel Stenberg
					Daniel Stenberg