[bugfix] FS#13812 - ZXBox always returns a leak file handles error

tapefiles return a leak handle error if it is quit before end of tape is
reached, ensure it always gets closed on exit

Change-Id: I0f6224c7164fd87c209166be9e10d62d6a644a50

apps/plugins/zxbox/spconf.c

@@ -106,9 +106,13 @@ static int find_extension(const char *ext)
 void spcf_read_command_line(const void* parameter)
 {
   int ix;
-
-  ix = find_extension( parameter - 3 + rb->strlen (parameter) );
-      
+  const char *ext = rb->strrchr(parameter, '.');
+  ix = (ext ? find_extension(ext+1) : -1);
+  if (ix < 0)
+  {
+    rb->splash(HZ*2, "Invalid extension");
+    return;
+  }
   file_type = extensions[ix].type;
   file_subtype = extensions[ix].subtype;
   rb->strlcpy(filenamebuf, parameter, MAXFILENAME - 10 + 1);

apps/plugins/zxbox/spmain.c

@@ -47,6 +47,8 @@
 
 #include "zxbox_keyb.h"
 
+#include "tapefile.h"
+
 int endofsingle IBSS_ATTR;
 
 int sp_nosync IBSS_ATTR = 0;
@@ -519,4 +521,5 @@ void start_spectemu(const void *parameter)
   init_spect_key();
 
   run_singlemode();
+  close_tapefile(); /* Bugfix leak file handles */
 }