Revert "MINOR: istbuf: add b_fromist() to make a buffer from an ist"
This reverts commit 9e46496d45ff06317ae8f4f785e6117e5b786f6f. It was
wrong and is not reliable, depending on the compiler's version and
optimization, as the struct is assigned inside a statement, thus on
its own stack. It's not needed anymore now so let's remove this.
diff --git a/include/common/istbuf.h b/include/common/istbuf.h
index 933ec99..9b6ce7c 100644
--- a/include/common/istbuf.h
+++ b/include/common/istbuf.h
@@ -33,9 +33,6 @@
#include <common/ist.h>
-/* makes a buffer pointer from an IST */
-#define b_fromist(in) ({ const struct ist __i = (in); &(const struct buffer){ .area = __i.ptr, .head = 0, .data = __i.len, .size = __i.len}; })
-
/* b_isteq() : returns > 0 if the first <n> characters of buffer <b> starting
* at offset <o> relative to the buffer's head match <ist>. (empty strings do
* match). It is designed to be used with reasonably small strings (it matches