drm: msm: adreno: use DEFINE_DEBUGFS_ATTRIBUTE with debugfs_create_file_unsafe()

Using DEFINE_DEBUGFS_ATTRIBUTE macro with debugfs_create_file_unsafe()
function in place of the debugfs_create_file() function will make the
file operation struct "reset" aware of the file's lifetime. Additional
details here: https://lists.archive.carbon60.com/linux/kernel/2369498

Issue reported by Coccinelle script:
scripts/coccinelle/api/debugfs/debugfs_simple_attr.cocci
Signed-off-by: Deepak R Varma <mh12gx2825@gmail.com>
Link: https://lore.kernel.org/r/9ca2c2e4cbd9ebb282b90f742305fd9b481aacc2.1603998014.git.mh12gx2825@gmail.comSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/adreno/a5xx_debugfs.c

@@ -138,7 +138,7 @@ reset_set(void *data, u64 val)
 	return 0;
 }
 
-DEFINE_SIMPLE_ATTRIBUTE(reset_fops, NULL, reset_set, "%llx\n");
+DEFINE_DEBUGFS_ATTRIBUTE(reset_fops, NULL, reset_set, "%llx\n");
 
 
 void a5xx_debugfs_init(struct msm_gpu *gpu, struct drm_minor *minor)
@@ -154,6 +154,6 @@ void a5xx_debugfs_init(struct msm_gpu *gpu, struct drm_minor *minor)
 				 ARRAY_SIZE(a5xx_debugfs_list),
 				 minor->debugfs_root, minor);
 
-	debugfs_create_file("reset", S_IWUGO, minor->debugfs_root, dev,
-			    &reset_fops);
+	debugfs_create_file_unsafe("reset", S_IWUGO, minor->debugfs_root, dev,
+				&reset_fops);
 }