ncurses: dont rely on mnttype for partitioned blockdev (#4)

src/growlight.h

@@ -140,7 +140,7 @@ typedef struct device {
 	char *sched;		// I/O scheduler (can be NULL)
 	unsigned roflag;	// Read-only flag (hdparm -r, blockdev --getro)
 	int slave;		// Number of owning devices
-	union {
+	union { // keyed off value of "layout" enum below
 		struct {
 			transport_e transport;
 			unsigned realdev: 1;	// Is itself a real block device

src/ncurses.c

@@ -968,7 +968,11 @@ print_blockbar(WINDOW *w,const blockobj *bo,int y,int sx,int ex,int selected){
 
 	zs = d->mntsize ? d->mntsize :
 		(last_usable_sector(d) - first_usable_sector(d) + 1) * bo->d->logsec;
-	if(d->mnttype){
+	// Sometimes, a partitioned block device will be given a mnttype by
+	// libblkid (usually due to a filesystem signature in unpartitioned
+	// space at the beginning). In that case, don't try to print based off
+	// the bogon block device mnttype.
+	if(d->mnttype && (d->layout != LAYOUT_NONE || !d->blkdev.pttable)){
 		int co = mnttype_aggregablep(d->mnttype) ?
 			COLOR_PAIR(PART_COLOR0) : COLOR_PAIR(FS_COLOR);