Initialize more members in zip_source_zip, so zip_source_stat works before zip_source_open (needed by zip_close).

lib/zip_source_crc.c

diff --git a/lib/zip_source_crc.c b/lib/zip_source_crc.c
index f127796..99bc965 100644
--- a/lib/zip_source_crc.c
+++ b/lib/zip_source_crc.c
@@ -66,8 +66,12 @@
 	return NULL;
     }
 
+    ctx->eof = 0;
     ctx->validate = validate;
-
+    ctx->e[0] = ctx->e[1] = 0;
+    ctx->size = 0;
+    ctx->crc = 0;
+    
     return zip_source_layered(za, src, crc_read, ctx);
 }