[PATCH] Cleanup read_cache_from error handling.

["Shawn O. Pearce" <spearce@spearce.org>]

When I converted the mmap() call to xmmap() I failed to cleanup the
way this routine handles errors and left some crufty code behind.
This is a small cleanup, suggested by Johannes.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
---
 This is on top of my sp/mmap topic.

 read-cache.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/read-cache.c b/read-cache.c
index ca3efbb..29cf9ab 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -793,16 +793,16 @@ int read_cache_from(const char *path)
 		die("index file open failed (%s)", strerror(errno));
 	}
 
-	cache_mmap = MAP_FAILED;
 	if (!fstat(fd, &st)) {
 		cache_mmap_size = st.st_size;
 		errno = EINVAL;
 		if (cache_mmap_size >= sizeof(struct cache_header) + 20)
 			cache_mmap = xmmap(NULL, cache_mmap_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
-	}
+		else
+			die("index file smaller than expected");
+	} else
+		die("cannot stat the open index (%s)", strerror(errno));
 	close(fd);
-	if (cache_mmap == MAP_FAILED)
-		die("index file mmap failed (%s)", strerror(errno));
 
 	hdr = cache_mmap;
 	if (verify_hdr(hdr, cache_mmap_size) < 0)
-- 
1.4.4.3.gd2e4