Fix a bug in the new VALID() method, false is not true

include/akerror.tmpl.h

@@ -74,6 +74,7 @@ char *akerr_name_for_status(int status, char *name);
 void akerr_init();
 void akerr_default_handler_unhandled_error(akerr_ErrorContext *ptr);
 void akerr_default_logger(const char *f, ...);
+int akerr_valid_error_address(akerr_ErrorContext *ptr);
 /* defined in src/errno.c which is built dynamically at build time from system errno definitions */
 void akerr_init_errno(void);
 
@@ -178,7 +179,7 @@ void akerr_init_errno(void);
 
 #define VALID(__err_context, __stmt)                       \
     __stmt;                                                \
-    if ( akerr_valid_error_address(__err_context) == 0 ) { \
+    if ( akerr_valid_error_address(__err_context) == 1 ) { \
 	FAIL(__err_context, AKERR_BEHAVIOR, "Received (akerr_Error *) from an invalid memory region. (Did the method finish without calling SUCCEED_RETURN?)"); \
     }