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plan9: use MIN in memmove on resize

--- a/plan9.c

+++ b/plan9.c

@@ -967,12 +967,11 @@

 			mbuf_reusable_ensure_size(&mscr, h, w);

 			memset(mscr.buffer, 0, w*h);

 			for (n = 0; n < oldh; n++)

-				memmove(&mscr.buffer[n*w], &mbuf.buffer[n*oldw], oldw);

+				memmove(&mscr.buffer[n*w], &mbuf.buffer[n*oldw], MIN(w, oldw));

 			mbuf_reusable_ensure_size(&mbuf, h, w);

 			memmove(mbuf.buffer, mscr.buffer, w*h);

 			linebuf = realloc(linebuf, sizeof(Rune)*MAX(w+1, 64));

-			field_resize_raw(&copyfield, h, w);

 			field_copy(&field, &copyfield);

 			field_resize_raw(&field, h, w);

 			memset(field.buffer, '.', w*h);