Add dummy macros for conditionally defined macros (#211)

Cppcheck reports "unknownMacro" when a conditionally defined macro is
used.

This patch adds dummy macros to make code pass the static analytics
without other effects.  The assignments and increments make cppcheck
consider the variables are used to suppress potential reports about
uninitialized variables, unused variables, and can-be-constant
variables.  The pointers with value 1 instead of NULL suppress reports
about indirectly getting value of null pointers.

Closes #210

Change-Id: Ia8db49c0c71ab82d5da10ce389f57ebb69c99051

Author: lumynou5

list.h

@@ -411,6 +411,12 @@ static inline void list_move_tail(struct list_head *node,
     for (entry = list_entry((head)->next, typeof(*entry), member); \
          &entry->member != (head);                                 \
          entry = list_entry(entry->member.next, typeof(*entry), member))
+#else
+/* The negative width bit-field makes a compile-time error for use of this. It
+ * works in the same way as BUILD_BUG_ON_ZERO macro of Linux kernel.
+ */
+#define list_for_each_entry(entry, head, member) \
+    for (entry = (void *) 1; sizeof(struct { int : -1; }); ++(entry))
 #endif
 
 /**
@@ -450,6 +456,10 @@ static inline void list_move_tail(struct list_head *node,
         safe = list_entry(entry->member.next, typeof(*entry), member); \
          &entry->member != (head); entry = safe,                       \
         safe = list_entry(safe->member.next, typeof(*entry), member))
+#else
+#define list_for_each_entry_safe(entry, safe, head, member)       \
+    for (entry = safe = (void *) 1; sizeof(struct { int : -1; }); \
+         ++(entry), ++(safe))
 #endif
 
 #undef __LIST_HAVE_TYPEOF

scripts/checksums

@@ -1,3 +1,3 @@
 db6784ff3917888db4d1dceaa0570d99ed40e762  queue.h
-a35ff719849dbe38d903576a332989c5ba7242bf  list.h
+27d7a57c6bab59beda9178f240db1aa7c0062361  list.h
 3bb0192cee08d165fd597a9f6fbb404533e28fcf  scripts/check-commitlog.sh