[master] 9cc2fd874 miniobj: Use sizeof for ALLOC_FLEX_OBJ()

[Dridi Boukelmoune]

commit 9cc2fd874758e4cfcbfe2cb22b46fd629041b3ad
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Mon Aug 21 16:40:36 2023 +0200

    miniobj: Use sizeof for ALLOC_FLEX_OBJ()
    
    Even though the flexible array may start inside the padding, an array of
    zero elements could then lead to less than sizeof bytes.

diff --git a/include/miniobj.h b/include/miniobj.h
index 7551cab53..fcdc9210c 100644
--- a/include/miniobj.h
+++ b/include/miniobj.h
@@ -32,7 +32,7 @@
 
 #define ALLOC_FLEX_OBJ(to, fld, len, type_magic)			\
 	do {								\
-		(to) = calloc(1, offsetof(typeof(*(to)), fld) +		\
+		(to) = calloc(1, sizeof(*(to)) +			\
 		    ((len) * sizeof *((to)->fld)));			\
 		if ((to) != NULL)					\
 			(to)->magic = (type_magic);			\