tools/testing/radix-tree/idr-test: add missing MODULE_DESCRIPTION define

Userspace builds of the radix-tree testing suite fails because of patch
KUnit: add missing MODULE_DESCRIPTION() macros for lib/test_*.ko. Add the
proper defines to tools/testing/radix-tree/idr-test.c so
MODULE_DESCRIPTION has a definition. This allows the build to succeed.

Link: https://lkml.kernel.org/r/[e-mail]
Fixes: f069e33dafe1 ("KUnit: add missing MODULE_DESCRIPTION() macros for lib/test_*.ko")
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/idr-test.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)
 void ida_dump(struct ida *);