fix calloc argument order

These were found through gcc warnings.

Message-ID: <[email protected]>

mflag.c

@@ -145,7 +145,7 @@ main(int argc, char *argv[])
 			return 0;
 		}
 
-		args = calloc(sizeof (char *), argsalloc);
+		args = calloc(argsalloc, sizeof (char *));
 		if (!args)
 			exit(-1);
 

msort.c

@@ -319,7 +319,7 @@ main(int argc, char *argv[])
 
 	xpledge("stdio rpath", "");
 
-	mails = calloc(sizeof (struct mail), mailalloc);
+	mails = calloc(mailalloc, sizeof (struct mail));
 	if (!mails)
 		exit(-1);
 

mthread.c

@@ -365,7 +365,7 @@ sort_tree(struct container *c, int depth)
 		if (i == 1)  // no sort needed
 			return;
 
-		struct container **a = calloc(sizeof (struct container *), i);
+		struct container **a = calloc(i, sizeof (struct container *));
 		if (!a)
 			return;