pythongh-126456: Fix _pyrepl curses tigetstr() (pythonGH-126472)

(cherry picked from commit b2bbdc5)

Co-authored-by: Victor Stinner <[email protected]>

Lib/_pyrepl/_minimal_curses.py

@@ -34,7 +34,7 @@ def _find_clib() -> str:
 clib.setupterm.restype = ctypes.c_int
 
 clib.tigetstr.argtypes = [ctypes.c_char_p]
-clib.tigetstr.restype = ctypes.POINTER(ctypes.c_char)
+clib.tigetstr.restype = ctypes.c_ssize_t
 
 clib.tparm.argtypes = [ctypes.c_char_p] + 9 * [ctypes.c_int]  # type: ignore[operator]
 clib.tparm.restype = ctypes.c_char_p
@@ -56,7 +56,7 @@ def tigetstr(cap):
     if not isinstance(cap, bytes):
         cap = cap.encode("ascii")
     result = clib.tigetstr(cap)
-    if ctypes.cast(result, ctypes.c_void_p).value == ERR:
+    if result == ERR:
         return None
     return ctypes.cast(result, ctypes.c_char_p).value