hs: remove redundant file handle in HSLoadCache

HSLoadCache opened the cache file but never used the resulting handle
for reading. The actual read was done by HSReadStream which opened
the same file independently.

Removed the unused fopen/fclose pair and flattened the control flow.

Ticket: 8325

src/util-mpm-hs-cache.c

@@ -133,38 +133,30 @@ int HSLoadCache(hs_database_t **hs_db, const char *hs_db_hash, const char *dirpa
     if (!SCPathExists(hash_file_static))
         return -1;
 
-    FILE *db_cache = fopen(hash_file_static, "r");
     char *buffer = NULL;
-    if (db_cache) {
-        size_t buffer_size;
-        buffer = HSReadStream(hash_file_static, &buffer_size);
-        if (!buffer) {
-            SCLogWarning("Hyperscan cached DB file %s cannot be read", hash_file_static);
-            ret = -1;
-            goto freeup;
-        }
-
-        hs_error_t error = hs_deserialize_database(buffer, buffer_size, hs_db);
-        if (error != HS_SUCCESS) {
-            SCLogWarning("Failed to deserialize Hyperscan database of %s: %s", hash_file_static,
-                    HSErrorToStr(error));
-            ret = -1;
-            goto freeup;
-        }
+    size_t buffer_size;
+    buffer = HSReadStream(hash_file_static, &buffer_size);
+    if (!buffer) {
+        SCLogWarning("Hyperscan cached DB file %s cannot be read", hash_file_static);
+        return -1;
+    }
 
-        ret = 0;
-        /* Touch file to update modification time so active caches are retained. */
-        if (SCTouchFile(hash_file_static) != 0) {
-            SCLogDebug("Failed to update mtime for %s", hash_file_static);
-        }
+    hs_error_t error = hs_deserialize_database(buffer, buffer_size, hs_db);
+    if (error != HS_SUCCESS) {
+        SCLogWarning("Failed to deserialize Hyperscan database of %s: %s", hash_file_static,
+                HSErrorToStr(error));
+        ret = -1;
         goto freeup;
     }
 
+    ret = 0;
+    /* Touch file to update modification time so active caches are retained. */
+    if (SCTouchFile(hash_file_static) != 0) {
+        SCLogDebug("Failed to update mtime for %s", hash_file_static);
+    }
+
 freeup:
-    if (db_cache)
-        fclose(db_cache);
-    if (buffer)
-        SCFree(buffer);
+    SCFree(buffer);
     return ret;
 }