[PATH] fix segfault in fsck-cache

I somehow got some corrupted object files in my repository that zlib 
refuses to decompress. This patch makes sure we abort early before the 
memcpy a few lines downtream segfaults (due to total_out == 0).

Andreas

Signed-off-by: Andreas Gal <gal@uci.edu>

--- 66308ede85c2dad6b184fb74a7215b06a173d8f7/sha1_file.c
+++ sha1_file.c
@@ -155,6 +155,8 @@
 
 	inflateInit(&stream);
 	ret = inflate(&stream, 0);
+	if (ret != Z_OK)
+		return NULL;
 	if (sscanf(buffer, "%10s %lu", type, size) != 2)
 		return NULL;
 

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