Fix for talloc, in order to improve mesa shader compiler performance on windows from abysmal to m...

third_party/talloc/talloc.c

Index: third_party/talloc/talloc.c
===================================================================
--- third_party/talloc/talloc.c	(revision 78688)
+++ third_party/talloc/talloc.c	(working copy)
@@ -1722,11 +1722,9 @@
 	int len;
 	char *ret;
 	va_list ap2;
-	char c;
 
-	/* this call looks strange, but it makes it work on older solaris boxes */
 	va_copy(ap2, ap);
-	len = vsnprintf(&c, 1, fmt, ap2);
+	len = vsnprintf(NULL, 0, fmt, ap2);
 	va_end(ap2);
 	if (unlikely(len < 0)) {
 		return NULL;
@@ -1773,10 +1771,9 @@
 	size_t alen;
 #endif
 	va_list ap2;
-	char c;
 
 	va_copy(ap2, ap);
-	alen = vsnprintf(&c, 1, fmt, ap2);
+	alen = vsnprintf(NULL, 0, fmt, ap2);
 	va_end(ap2);
 
 	if (alen <= 0) {