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

The macro is more efficient

1 files changed, 1 insertions, 1 deletions

diff --git a/malloc.c b/malloc.c
index ded9868af8..66db775f6f 100644
--- 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)