Fix GCC warning: ‘fptr’ may be used uninitialized in this function

This does look like a false positive to me: the if clauses that use fptr appear
to only cover the same values as the switch-case statements. But harmless
defensive change here.

src/syncterm/ooii.c

@@ -216,7 +216,7 @@ term_setattr(int attr)
 static void
 readInPix(char codeCh, int ooii_mode)
 {
-	int fptr;
+	int fptr = 0;
 
 	term_clearscreen();
 	term_gotoxy(1, 1);