Fix bogus error message from merge-recursive error path

This error message should not usually trigger, but the function
make_cache_entry() called by add_cacheinfo() can return early
without calling into refresh_cache_entry() that sets cache_errno.

Also the error message had a wrong function name reported, and
it did not say anything about which path failed either.

Signed-off-by: Junio C Hamano <junkio@cox.net>

3 files changed, 2 insertions, 3 deletions

diff --git a/cache.h b/cache.h
index 1f128d55d..467e6a579 100644
--- a/cache.h
+++ b/cache.h
@@ -128,7 +128,6 @@ static inline unsigned int ce_mode_from_stat(struct cache_entry *ce, unsigned in
 extern struct cache_entry **active_cache;
 extern unsigned int active_nr, active_alloc, active_cache_changed;
 extern struct cache_tree *active_cache_tree;
-extern int cache_errno;
 
 enum object_type {
 	OBJ_BAD = -1,
diff --git a/merge-recursive.c b/merge-recursive.c
index e1aebd772..3611a2bdb 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -221,7 +221,7 @@ static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
 	struct cache_entry *ce;
 	ce = make_cache_entry(mode, sha1 ? sha1 : null_sha1, path, stage, refresh);
 	if (!ce)
-		return error("cache_addinfo failed: %s", strerror(cache_errno));
+		return error("addinfo_cache failed for path '%s'", path);
 	return add_cache_entry(ce, options);
 }
 
diff --git a/read-cache.c b/read-cache.c
index 6339a278d..8a7506d90 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -24,7 +24,7 @@ unsigned int active_nr, active_alloc, active_cache_changed;
 
 struct cache_tree *active_cache_tree;
 
-int cache_errno;
+static int cache_errno;
 
 static void *cache_mmap;
 static size_t cache_mmap_size;