fix: 修复 virpart.c 不适配的格式化打印问题

Close #I4PEVP
Signed-off-by: NFar <yesiyuan2@huawei.com>

fs/fat/virpart/src/virpart.c

@@ -347,7 +347,7 @@ INT FatFsBindVirPart(void *handle, BYTE vol)
         return -EINVAL;
     }
 
-    ret = snprintf_s(path, sizeof(path), sizeof(path) - 1, "%d:/", vol);
+    ret = snprintf_s(path, sizeof(path), sizeof(path) - 1, "%u:/", vol);
     if (ret < 0) {
         return -EINVAL;
     }
@@ -420,7 +420,7 @@ INT FatFsMakeVirPart(void *handle, BYTE vol)
         return -EINVAL;
     }
 
-    ret = snprintf_s(path, sizeof(path), sizeof(path) - 1, "%d:/", vol);
+    ret = snprintf_s(path, sizeof(path), sizeof(path) - 1, "%u:/", vol);
     if (ret < 0) {
         return -EINVAL;
     }