[Minor] Fix some minor code quality issue

Found by: coverity scan

5 files changed, 27 insertions, 15 deletions

diff --git a/src/libstat/backends/mmaped_file.c b/src/libstat/backends/mmaped_file.c
index f87e9e6bd..7d67fa053 100644
--- a/src/libstat/backends/mmaped_file.c
+++ b/src/libstat/backends/mmaped_file.c
@@ -571,6 +571,7 @@ rspamd_mmaped_file_open (rspamd_mempool_t *pool,
 	lock_fd = open (lock, O_WRONLY|O_CREAT|O_EXCL, 00600);
 
 	if (lock_fd == -1) {
+		g_free (lock);
 		msg_info_pool ("cannot open file %s, it is locked by another process",
 				filename);
 		return NULL;
diff --git a/src/libstat/backends/redis_backend.c b/src/libstat/backends/redis_backend.c
index 2fd69f436..fdbb77f78 100644
--- a/src/libstat/backends/redis_backend.c
+++ b/src/libstat/backends/redis_backend.c
@@ -153,15 +153,17 @@ rspamd_redis_expand_object (const gchar *pattern,
 	gint err_idx;
 
 	g_assert (ctx != NULL);
+	g_assert (task != NULL);
 	stcf = ctx->stcf;
 
 	L = task->cfg->lua_state;
+	g_assert (L != NULL);
 
 	if (ctx->enable_users) {
 		if (ctx->cbref_user == -1) {
 			rcpt = rspamd_task_get_principal_recipient (task);
 		}
-		else if (L) {
+		else {
 			/* Execute lua function to get userdata */
 			lua_pushcfunction (L, &rspamd_lua_traceback);
 			err_idx = lua_gettop (L);
@@ -269,7 +271,7 @@ rspamd_redis_expand_object (const gchar *pattern,
 	}
 
 
-	if (target == NULL || task == NULL) {
+	if (target == NULL) {
 		return -1;
 	}
 
diff --git a/src/libutil/sqlite_utils.c b/src/libutil/sqlite_utils.c
index 9bb0b9c1f..2a9da5469 100644
--- a/src/libutil/sqlite_utils.c
+++ b/src/libutil/sqlite_utils.c
@@ -338,20 +338,28 @@ rspamd_sqlite3_open_or_create (rspamd_mempool_t *pool, const gchar *path, const
 	rspamd_snprintf (lock_path, sizeof (lock_path), "%s.lock", path);
 	lock_fd = open (lock_path, O_WRONLY|O_CREAT|O_EXCL, 00600);
 
-	if (lock_fd == -1 && (errno == EEXIST || errno == EBUSY)) {
-		msg_debug_pool_check ("checking %s to wait for db being initialized", lock_path);
+	if (lock_fd == -1) {
+		if (errno == EEXIST || errno == EBUSY) {
+			msg_debug_pool_check ("checking %s to wait for db being initialized", lock_path);
 
-		if (!rspamd_sqlite3_wait (pool, lock_path)) {
-			g_set_error (err, rspamd_sqlite3_quark (),
-					errno, "cannot create sqlite file %s: %s",
-					path, strerror (errno));
+			if (!rspamd_sqlite3_wait(pool, lock_path)) {
+				g_set_error(err, rspamd_sqlite3_quark(),
+						errno, "cannot create sqlite file %s: %s",
+						path, strerror(errno));
 
-			return NULL;
-		}
+				return NULL;
+			}
 
-		/* At this point we have database created */
-		create = FALSE;
-		has_lock = FALSE;
+
+			/* At this point we have database created */
+			create = FALSE;
+			has_lock = FALSE;
+		}
+		else {
+			g_set_error(err, rspamd_sqlite3_quark(),
+					errno, "cannot lock sqlite file %s: %s",
+					path, strerror(errno));
+		}
 	}
 	else {
 		pid_t myself = getpid ();
diff --git a/src/lua/lua_common.c b/src/lua/lua_common.c
index cd557f816..ab411fa66 100644
--- a/src/lua/lua_common.c
+++ b/src/lua/lua_common.c
@@ -1001,10 +1001,10 @@ rspamd_lua_init (bool wipe_mem)
 
 	/* Set PRNG */
 	lua_getglobal (L, "math");
-	lua_pushstring (L, "randomseed");
+	lua_pushstring (L, "randomseed"); /* Push math.randomseed function on top of the stack */
 	lua_gettable (L, -2);
 	lua_pushinteger (L, ottery_rand_uint64 ());
-	lua_pcall (L, 1, 0, 0);
+	g_assert (lua_pcall (L, 1, 0, 0) == 0);
 	lua_pop (L, 1); /* math table */
 
 	/* Modules state */
diff --git a/src/plugins/fuzzy_check.c b/src/plugins/fuzzy_check.c
index ea8bcf756..e26ce2a77 100644
--- a/src/plugins/fuzzy_check.c
+++ b/src/plugins/fuzzy_check.c
@@ -3846,6 +3846,7 @@ static gint
 fuzzy_lua_unlearn_handler (lua_State *L)
 {
 	struct rspamd_task *task = lua_check_task (L, 1);
+	g_assert (task != NULL);
 	guint flag = 0, weight = 1.0, send_flags = 0;
 	const gchar *symbol;
 	struct fuzzy_ctx *fuzzy_module_ctx = fuzzy_get_context (task->cfg);