tty/vt: consolemap: saner variable names in con_do_clear_unimap()

The function uses too vague variable names like i, j, k for iterators, p,
q, p1, p2 for pointers etc.

Rename all these, so that it is clear what is going on:
- dict: for dictionaries.
- d, r, g: for dir, row, glyph iterators -- these are unsigned now.
- dir, row: for directory and row pointers.
- glyph: for the glyph.
- and so on...

This is a lot of shuffling, but the result pays off, IMO.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20220607104946.18710-24-jslaby@suse.czSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/vt/consolemap.c

@@ -531,24 +531,23 @@ con_insert_unipair(struct uni_pagedict *p, u_short unicode, u_short fontpos)
 /* Caller must hold the lock */
 static int con_do_clear_unimap(struct vc_data *vc)
 {
-	struct uni_pagedict *p, *q;
+	struct uni_pagedict *old = *vc->vc_uni_pagedir_loc;
 
-	p = *vc->vc_uni_pagedir_loc;
-	if (!p || --p->refcount) {
-		q = kzalloc(sizeof(*p), GFP_KERNEL);
-		if (!q) {
-			if (p)
-				p->refcount++;
+	if (!old || --old->refcount) {
+		struct uni_pagedict *new = kzalloc(sizeof(*new), GFP_KERNEL);
+		if (!new) {
+			if (old)
+				old->refcount++;
 			return -ENOMEM;
 		}
-		q->refcount=1;
-		*vc->vc_uni_pagedir_loc = q;
+		new->refcount = 1;
+		*vc->vc_uni_pagedir_loc = new;
 	} else {
-		if (p == dflt)
+		if (old == dflt)
 			dflt = NULL;
-		p->refcount++;
-		p->sum = 0;
-		con_release_unimap(p);
+		old->refcount++;
+		old->sum = 0;
+		con_release_unimap(old);
 	}
 	return 0;
 }