malloc.c: Use isDIGIT macro instead of hand-rolling it

The macro is more efficient

diff --git a/malloc.c b/malloc.c
index ded9868..66db775 100644 (file)
--- a/malloc.c
+++ b/malloc.c
@@ -1688,7 +1688,7 @@ morecore(int bucket)
                    IV val = 0;
 
                    t += 2;
-                   while (*t <= '9' && *t >= '0')
+                   while (isDIGIT(*t))
                        val = 10*val + *t++ - '0';
                    if (!*t || *t == ';') {
                        if (MallocCfg[off - opts] != val)