silence gcc 'comparison is always false' warning in MEM_WRAP_CHECK

Only a partial fix: works where sizeof(type)==1; since we
can never wraparound in that case, disarm the check

p4raw-id: //depot/perl@25034

diff --git a/handy.h b/handy.h
index 09c8c79..911aca8 100644 (file)
--- a/handy.h
+++ b/handy.h
@@ -598,7 +598,7 @@ hopefully catches attempts to access uninitialized memory.
 
 #ifdef PERL_MALLOC_WRAP
 #define MEM_WRAP_CHECK(n,t) \
-       (void)((n)>((MEM_SIZE)~0)/sizeof(t)?(Perl_croak_nocontext(PL_memory_wrap),0):0)
+       (void)((sizeof(t)>1?n:0)>((MEM_SIZE)~0)/sizeof(t)?(Perl_croak_nocontext(PL_memory_wrap),0):0)
 #define MEM_WRAP_CHECK_1(n,t,a) \
        (void)((n)>((MEM_SIZE)~0)/sizeof(t)?(Perl_croak_nocontext(a),0):0)
 #define MEM_WRAP_CHECK_2(n,t,a,b) \