bitmap: Define a cleanup function for bitmaps

BugLink: https://bugs.launchpad.net/bugs/2103496

Add support for autopointers for bitmaps allocated with bitmap_alloc()
et al.

Signed-off-by: Bartosz Golaszewski<bartosz.golaszewski@linaro.org>
Signed-off-by: Thomas Gleixner<tglx@linutronix.de>
Reviewed-by: Andy Shevchenko<andriy.shevchenko@linux.intel.com>
Acked-by: Yury Norov<yury.norov@gmail.com>
Link:https://lore.kernel.org/r/20240122124243.44002-2-brgl@bgdev.pl

(cherry picked from commit d12a82848eac28d248e67940378fe4a72b0a8cd3)
Signed-off-by: Koichiro Den<koichiro.den@canonical.com>
Acked-by: Jacob Martin <jacob.martin@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

include/linux/bitmap.h

@@ -6,6 +6,7 @@
 
 #include <linux/align.h>
 #include <linux/bitops.h>
+#include <linux/cleanup.h>
 #include <linux/errno.h>
 #include <linux/find.h>
 #include <linux/limits.h>
@@ -131,6 +132,8 @@ unsigned long *bitmap_alloc_node(unsigned int nbits, gfp_t flags, int node);
 unsigned long *bitmap_zalloc_node(unsigned int nbits, gfp_t flags, int node);
 void bitmap_free(const unsigned long *bitmap);
 
+DEFINE_FREE(bitmap, unsigned long *, if (_T) bitmap_free(_T))
+
 /* Managed variants of the above. */
 unsigned long *devm_bitmap_alloc(struct device *dev,
 				 unsigned int nbits, gfp_t flags);