Close some file descriptors that were left dangling before

tile.cc

@@ -1343,6 +1343,17 @@ int traverse_zooms(int *geomfd, off_t *geom_size, char *metabase, char *stringpo
 		}
 	}
 
+	int j;
+	for (j = 0; j < TEMP_FILES; j++) {
+		// Can be < 0 if there is only one source file, at z0
+		if (geomfd[j] >= 0) {
+			if (close(geomfd[j]) != 0) {
+				perror("close geom");
+				exit(EXIT_FAILURE);
+			}
+		}
+	}
+
 	if (!quiet) {
 		fprintf(stderr, "\n");
 	}