savestr() is basically xstrdup() with an optional path for "plan A"
where it returns NULL instead of fatal().

afaik, this is the only place where we don't check out_of_mem after
savestr().  bailing out seems nicer than crashing on the next line.

ok?

diff /home/op/w/patch
path + /home/op/w/patch
commit - df4e48f5c58474cd91cf83065e253c9efdfe5d93
blob - c94a3f2beb10a18d9687941619e72776bf160a7f
file + util.c
--- util.c
+++ util.c
@@ -356,6 +356,8 @@ fetchname(const char *at, bool *exists, int strip_lead
 	if (strnEQ(at, _PATH_DEVNULL, sizeof(_PATH_DEVNULL) - 1))
 		return NULL;
 	name = fullname = t = savestr(at);
+	if (out_of_mem)
+		return NULL;
 
 	tab = strchr(t, '\t') != NULL;
 	/* Strip off up to `strip_leading' path components and NUL terminate. */