tresize: remove unnecessary if

st.c

@@ -2783,10 +2783,8 @@ tresize(int col, int row) {
 		free(term.line[i]);
 		free(term.alt[i]);
 	}
-	if(i > 0) {
-		memmove(term.line, term.line + i, row * sizeof(Line));
-		memmove(term.alt, term.alt + i, row * sizeof(Line));
-	}
+	memmove(term.line, term.line + i, row * sizeof(Line));
+	memmove(term.alt, term.alt + i, row * sizeof(Line));
 	for(i += row; i < term.row; i++) {
 		free(term.line[i]);
 		free(term.alt[i]);