[PATCH] dtoc: test: add missing escape in help text

[Francesco Valla]

A single percent sign might be interpreted as a string format directive
and shall thus be escaped - doubling it - to actually indicate a
percentage.

Without the escape, pytest fails to run test_fdt.py with the following
error:

  ValueError: Test coverage failure
  fdt code coverage: Traceback (most recent call last):
    File "/usr/lib64/python3.14/argparse.py", line 1748, in _check_help
      formatter._expand_help(action)
      ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^
    File "/usr/lib64/python3.14/argparse.py", line 676, in _expand_help
      return help_string % params
             ~~~~~~~~~~~~^~~~~~~~
  TypeError: %c requires an int or a unicode character, not dict

  The above exception was the direct cause of the following exception:

  Traceback (most recent call last):
    File "/home/user/u-boot/./tools/dtoc/test_fdt", line 1002, in <module>
      sys.exit(main())
               ~~~~^^
    File "/home/user/u-boot/./tools/dtoc/test_fdt", line 987, in main
      parser.add_argument('-T', '--test-coverage', action='store_true',
      ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                          default=False,
                          ^^^^^^^^^^^^^^
                          help='run tests and check for 100% coverage')
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/usr/lib64/python3.14/argparse.py", line 1562, in add_argument
      self._check_help(action)
      ~~~~~~~~~~~~~~~~^^^^^^^^
    File "/usr/lib64/python3.14/argparse.py", line 1750, in _check_help
      raise ValueError('badly formed help string') from exc
  ValueError: badly formed help string

Fixes: 7640b166604e ("test_fdt: Convert to use argparse")
Signed-off-by: Francesco Valla <francesco at valla.it>
---
 tools/dtoc/test_fdt.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/dtoc/test_fdt.py b/tools/dtoc/test_fdt.py
index a0bed4e18bb8..f141f931a949 100755
--- a/tools/dtoc/test_fdt.py
+++ b/tools/dtoc/test_fdt.py
@@ -986,7 +986,7 @@ def main():
                         default=False, help='run tests')
     parser.add_argument('-T', '--test-coverage', action='store_true',
                         default=False,
-                        help='run tests and check for 100% coverage')
+                        help='run tests and check for 100%% coverage')
     parser.add_argument('name', nargs='*')
     args = parser.parse_args()
 

---
base-commit: 30b77f6aa146c96b831cb4ece038130b655b6a41
change-id: 20260531-test_fdt_fix-616b806c2206

Best regards,
--  
Francesco Valla <francesco at valla.it>