util_macros.h: fix kernel-doc for u64_to_user_ptr()
The added documentation to u64_to_user_ptr() misspelled the function name.
Fix it.
Link: https://lkml.kernel.org/r/20251104183834.1046584-1-andriy.shevchenko@linux.intel.com
Fixes: 029c896c4105 ("kernel.h: move PTR_IF() and u64_to_user_ptr() to util_macros.h")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Alexandru Ardelean <aardelean@baylibre.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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