Move tresize comments around.

st.c

@@ -2779,17 +2779,16 @@ tresize(int col, int row) {
 		return;
 	}
 
-	/* free unneeded rows */
-	for(i = 0; i < slide; i++) {
-		free(term.line[i]);
-		free(term.alt[i]);
-	}
-	if(slide > 0) {
 	/*
 	 * slide screen to keep cursor where we expect it -
 	 * tscrollup would work here, but we can optimize to
 	 * memmove because we're freeing the earlier lines
 	 */
+	for(i = 0; i < slide; i++) {
+		free(term.line[i]);
+		free(term.alt[i]);
+	}
+	if(slide > 0) {
 		memmove(term.line, term.line + slide, row * sizeof(Line));
 		memmove(term.alt, term.alt + slide, row * sizeof(Line));
 	}