linux: freebsd: do check on proper pointer

We want to check here if we added something to the list, not if the
function argument was valid. Problem spotted by Coverity, CID 50754.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

Doxyfile

@@ -38,7 +38,7 @@ PROJECT_NAME           = "libserialport"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = "0.1.1"
+PROJECT_NUMBER         = "unreleased development snapshot"
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a

freebsd.c

@@ -373,7 +373,7 @@ SP_PRIV enum sp_return list_ports(struct sp_port ***list)
 		DBG("%s: %s\n", __func__, entry.d_name);
 
 		*list = list_append(*list, name);
-		if (!list) {
+		if (!*list) {
 			SET_ERROR(ret, SP_ERR_MEM, "List append failed");
 			break;
 		}

linux.c

@@ -236,7 +236,7 @@ SP_PRIV enum sp_return list_ports(struct sp_port ***list)
 		}
 		DEBUG_FMT("Found port %s", name);
 		*list = list_append(*list, name);
-		if (!list) {
+		if (!*list) {
 			SET_ERROR(ret, SP_ERR_MEM, "List append failed");
 			break;
 		}