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audio/mkplist: don't fail entirely if a directory is not accessible

--- a/sys/src/cmd/audio/zuke/mkplist.c

+++ b/sys/src/cmd/audio/zuke/mkplist.c

@@ -47,8 +47,10 @@

 	else if((numall & (numall-1)) == 0)

 		all = realloc(all, numall*2*sizeof(Meta));

-	if(all == nil)

+	if(all == nil){

+		sysfatal("newmeta: no memory");

 		return nil;

+	}

 	memset(&all[numall++], 0, sizeof(Meta));

 	return &all[numall-1];

@@ -184,8 +186,7 @@

 		fprint(2, "%s: %r\n", path);

 		return;

 	}

-	if((curr = newmeta()) == nil)

-		sysfatal("no memory");

+	curr = newmeta();

 	firstiscomposer = keepfirstartist = 0;

 	res = tagsget(&ctx);

 	if(ctx.format != Funknown){

@@ -227,11 +228,13 @@

 	long n;

 	int dirfd, len;

-	if((dirfd = open(*dir, OREAD)) < 0)

-		sysfatal("%s: %r", *dir);

+	if((dirfd = open(*dir, OREAD)) < 0){

+		fprint(2, "scan: %r\n");

+		return -1;

+	}

 	len = strlen(*dir);

 	if((*dir = realloc(*dir, len+1+Maxname)) == nil)

-		sysfatal("no memory");

+		sysfatal("scan: no memory");

 	path = *dir;

 	path[len] = '/';

@@ -346,8 +349,7 @@

 	for(i = 0; i < argc; i++){

 		if(strncmp(argv[i], "http://", 7) == 0 || strncmp(argv[i], "https://", 8) == 0){

-			if((curr = newmeta()) == nil)

-				sysfatal("no memory");

+			curr = newmeta();

 			curr->title = argv[i];

 			curr->path = argv[i];

 			curr->filefmt = "";