Don't crash when song cannot be loaded via LASH.

Consider invalid song path given via command line a fatal error.

lash.C

@@ -85,7 +85,8 @@ Lash::process ( void )
             {
                 MESSAGE( "LASH wants us to load \"%s\"", name );
 
-                load_song( name );
+                if ( ! load_song( name ) )
+                    /* FIXME: should we tell lash that we couldn't load the song? */;
 
                 lash_send_event( _client, lash_event_new_with_type( LASH_Restore_File ) );
 

main.C

@@ -100,13 +100,16 @@ load_song ( const char *name )
 {
     MESSAGE( "loading song \"%s\"", name );
 
+    Grid *pattern_grid = pattern_c->grid();
+    Grid *phrase_grid = phrase_c->grid();
+
     pattern_c->grid( NULL );
     phrase_c->grid( NULL );
 
     if ( ! playlist->load( name ) )
     {
         WARNING( "failed to load song file" );
-        return false;
+        goto failed;
     }
 
     pattern_c->grid( pattern::pattern_by_number( 1 ) );
@@ -117,6 +120,13 @@ load_song ( const char *name )
     song.dirty( false );
 
     return true;
+
+failed:
+
+    pattern_c->grid( pattern_grid );
+    phrase_c->grid( phrase_grid );
+
+    return false;
 }
 
 bool
@@ -163,7 +173,8 @@ main ( int argc, char **argv )
     if ( argc > 1 )
     {
         /* maybe a filename on the commandline */
-        load_song( argv[1] );
+        if ( ! load_song( argv[ 1 ] ) )
+            ASSERTION( "Could not load song \"%s\" specified on command line", argv[ 1 ] );
     }
 
     if ( ! midi_init() )

sequence.C

@@ -24,6 +24,8 @@
 
 #include "non.H"
 
+#include <errno.h>
+
 /* #include <string> */
 
 /* using std::string; */
@@ -281,7 +283,11 @@ sequence::load ( const char *name )
 {
     smf f;
 
-    f.open( name, smf::READ );
+    if ( ! f.open( name, smf::READ ) )
+    {
+        WARNING( "error opening file: %s", strerror( errno ) );
+        return false;
+    }
 
     f.read_header();
 

smf.C

@@ -64,7 +64,7 @@ smf::open ( const char *name, int mode )
 
     _fp = fopen( _name, mode == smf::WRITE ? "w" : "r" );
 
-    return _fp > 0;
+    return _fp != NULL;
 }
 
 /*************************/