use errno ENOMEM instead of EOVERFLOW

This matches the behaviour of setting errno for malloc/calloc on the following
systems too:

glibc, musl libc, OpenBSD libc.

It is also more portable for (older) systems.

1 files changed, 1 insertions, 1 deletions

diff --git a/sfeed.c b/sfeed.c
index e2f44b8..af4534c 100644
--- a/sfeed.c
+++ b/sfeed.c
@@ -293,7 +293,7 @@ string_append(String *s, const char *data, size_t len)
 		return;
 
 	if (s->len >= SIZE_MAX - len) {
-		errno = EOVERFLOW;
+		errno = ENOMEM;
 		err(1, "realloc");
 	}