SD library: Fix format (#9034)

Pass correct work buffer size to f_mkfs

Author: prplz

Diff for: libraries/SD/src/sd_diskio.cpp

@@ -818,7 +818,7 @@ bool sdcard_mount(uint8_t pdrv, const char* path, uint8_t max_files, bool format
             }
             //FRESULT f_mkfs (const TCHAR* path, const MKFS_PARM* opt, void* work, UINT len);
             const MKFS_PARM opt = {(BYTE)FM_ANY, 0, 0, 0, 0};
-            res = f_mkfs(drv, &opt, work, sizeof(work));
+            res = f_mkfs(drv, &opt, work, sizeof(BYTE) * FF_MAX_SS);
             free(work);
             if (res != FR_OK) {
                 log_e("f_mkfs failed: %s", fferr2str[res]);