reentr.c: Prevent infinite looping

This is an easy, though  paranoid hedge to prevent something that should
never happen from causing an infinite loop if it were to happen.

1 files changed, 1 insertions, 1 deletions

diff --git a/reentr.c b/reentr.c
index 8438c8f90f..2429aa2f5d 100644
--- a/reentr.c
+++ b/reentr.c
@@ -36,7 +36,7 @@
 
 #define RenewDouble(data_pointer, size_pointer, type) \
     STMT_START { \
-	const size_t size = *(size_pointer) * 2; \
+	const size_t size = MAX(*(size_pointer), 1) * 2; \
 	Renew((data_pointer), (size), type); \
 	*(size_pointer) = size; \
     } STMT_END