Merge pull request #10809 from kjbracey-arm/ns_list_stdint

ns_list: avoid UINT_FAST8_MAX (fix ARM C 5 builds)

Author: adbridge

features/frameworks/nanostack-libservice/mbed-client-libservice/ns_list.h

@@ -148,7 +148,7 @@ union \
 { \
     ns_list_t slist; \
     NS_FUNNY_COMPARE_OK \
-    NS_STATIC_ASSERT(link_offset <= UINT_FAST8_MAX, "link offset too large") \
+    NS_STATIC_ASSERT(link_offset <= (ns_list_offset_t) -1, "link offset too large") \
     NS_FUNNY_COMPARE_RESTORE \
     char (*offset)[link_offset + 1]; \
     entry_type *type; \