libmemdraw: fix fd leak in openmemsubfont and memory leak in freememsubfont

sys/src/libmemdraw/openmemsubfont.c

@@ -41,6 +41,7 @@ openmemsubfont(char *name)
 		free(fc);
 		goto Err;
 	}
+	close(fd);
 	free(p);
 	return sf;
 Err:

sys/src/libmemdraw/subfont.c

@@ -30,5 +30,6 @@ freememsubfont(Memsubfont *f)
 		return;
 	free(f->info);	/* note: f->info must have been malloc'ed! */
 	freememimage(f->bits);
+	free(f->name);
 	free(f);
 }