Fix typo

Author: joto

src/geom-from-osm.cpp

@@ -170,7 +170,7 @@ void create_multilinestring(geometry_t *geom,
         // retroactively.
         if (multiline.num_geometries() == 1 && !force_multi) {
             // This has to be done in two steps, because the set<>()
-            // destroys the content of mulitline.
+            // destroys the content of multiline.
             auto p = std::move(multiline[0]);
             geom->set<linestring_t>() = std::move(p);
         }