clean up leaks in faces.

Reference: /n/atom/patch/applied2013/faceleak
Date: Wed Dec  4 23:21:51 CET 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/faces/facedb.c	Wed Dec  4 23:21:39 2013
+++ /sys/src/cmd/faces/facedb.c	Wed Dec  4 23:21:39 2013
@@ -362,6 +362,7 @@
 	p = tryfindfile(dom, "unknown");
 	if(p != nil || strcmp(dom, facedom) == 0)
 		return p;
+	free(p);
 	return tryfindfile("unknown", "unknown");
 }
 
@@ -577,6 +578,7 @@
 		if(strstr(fn, "unknown"))
 			f->unknown = 1;
 		f->file = readface(fn);
+		free(fn);
 	}
 	if(f->file){
 		f->bit = f->file->image;
--- /sys/src/cmd/faces/util.c	Wed Dec  4 23:21:39 2013
+++ /sys/src/cmd/faces/util.c	Wed Dec  4 23:21:39 2013
@@ -36,6 +36,7 @@
 		fprint(2, "out of memory in strdup(%.10s)\n", s);
 		exits("mem");
 	}
+	setmalloctag(t, getcallerpc(&s));
 	return t;
 }