*: hopefully all setup_common_bufsiz() are in place

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

coreutils/sum.c

@@ -31,12 +31,14 @@ enum { SUM_BSD, PRINT_NAME, SUM_SYSV };
 /* Return 1 if successful.  */
 static unsigned sum_file(const char *file, unsigned type)
 {
-#define buf bb_common_bufsiz1
 	unsigned long long total_bytes = 0;
 	int fd, r;
 	/* The sum of all the input bytes, modulo (UINT_MAX + 1).  */
 	unsigned s = 0;
 
+#define buf bb_common_bufsiz1
+	setup_common_bufsiz();
+
 	fd = open_or_warn_stdin(file);
 	if (fd == -1)
 		return 0;