fixed the incorrect depth update incase of offset is 0 (bug 134)

src/detect-engine-payload.c

@@ -131,7 +131,7 @@ static int DoInspectPacketPayload(DetectEngineCtx *de_ctx,
 
                 /* update offset with prev_offset if we're searching for
                  * matches after the first occurence. */
-                SCLogDebug("offset %"PRIu32", prev_offset %"PRIu32, prev_offset, depth);
+                SCLogDebug("offset %"PRIu32", prev_offset %"PRIu32, offset, prev_offset);
                 offset += prev_offset;
 
                 SCLogDebug("offset %"PRIu32", depth %"PRIu32, offset, depth);

src/detect-offset.c

@@ -73,7 +73,7 @@ int DetectOffsetSetup (DetectEngineCtx *de_ctx, Signature *s, char *offsetstr)
                 return -1;
             }
             cd->offset = (uint32_t)atoi(str);
-            if (cd->depth != 0) {
+            if (cd->depth != 0 && cd->offset != 0) {
                 SCLogDebug("depth increased to %"PRIu32" to match pattern len"
                         " and offset", cd->content_len + cd->offset);
                 cd->depth = cd->content_len + cd->offset;