tools/testing/radix-tree: add missing MODULE_DESCRIPTION definition

Userspace builds of the radix-tree testing suite fails because of commit
test_maple_tree: add the missing MODULE_DESCRIPTION() macro. Add the
proper defines to tools/testing/radix-tree/maple.c and
tools/testing/radix-tree/xarray.c so MODULE_DESCRIPTION has a definition.
This allows the build to succeed.

Link: https://lkml.kernel.org/r/[e-mail]
Fixes: 9f8090e8c4d1 ("test_maple_tree: add the missing MODULE_DESCRIPTION() macro")
Signed-off-by: Sidhartha Kumar <[e-mail]>
Reviewed-by: Liam R. Howlett <[e-mail]>
Cc: Jeff Johnson <[e-mail]>
Cc: Matthew Wilcox (Oracle) <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

tools/testing/radix-tree/maple.c

···
 #define module_init(x)
 #define module_exit(x)
 #define MODULE_AUTHOR(x)
+#define MODULE_DESCRIPTION(X)
 #define MODULE_LICENSE(x)
 #define dump_stack()	assert(0)
 

tools/testing/radix-tree/xarray.c

···
 #define module_init(x)
 #define module_exit(x)
 #define MODULE_AUTHOR(x)
+#define MODULE_DESCRIPTION(X)
 #define MODULE_LICENSE(x)
 #define dump_stack()	assert(0)