bus-util: Fix reading uint32 properties

Fix copy&paste bug in map_basic() to use the correct data type for
SD_BUS_TYPE_UINT32. Before we were copying the wrong 32 bits into the
destination pointer, resulting in complete garbage on big-endian systems.

Fixes #2927

src/shared/bus-util.c

@@ -1068,7 +1068,7 @@ static int map_basic(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_
         }
 
         case SD_BUS_TYPE_UINT32: {
-                uint64_t u;
+                uint32_t u;
                 uint32_t *p = userdata;
 
                 r = sd_bus_message_read_basic(m, type, &u);