switch to libretro file streams & fix exception branch

libretro.c

@@ -66,7 +66,7 @@ read_m3u(const char *file)
 {
   char line[PATH_MAX];
   char name[PATH_MAX];
-  FILE *f = fopen(file, "r");
+  RFILE *f = filestream_open(file, RETRO_VFS_FILE_ACCESS_READ, RETRO_VFS_FILE_ACCESS_HINT_NONE);
 
   g_DISK_TOTAL = 0;
 
@@ -76,7 +76,7 @@ read_m3u(const char *file)
       return false;
     }
 
-  while (fgets(line, sizeof(line), f) && g_DISK_TOTAL <= M3U_MAX_FILE)
+  while (filestream_gets(f, line, sizeof(line)) && g_DISK_TOTAL <= M3U_MAX_FILE)
     {
       if (line[0] == '#')
         continue;
@@ -98,6 +98,7 @@ read_m3u(const char *file)
       if (strlen(g_ROMS_DIR) + strlen(line) + 1 >= PATH_MAX)
         {
           retro_log_printf_cb(RETRO_LOG_ERROR, "Path too long\n");
+          filestream_close(f);
           return false;
         }
 
@@ -109,7 +110,7 @@ read_m3u(const char *file)
         }
     }
 
-  fclose(f);
+  filestream_close(f);
   return (g_DISK_TOTAL != 0);
 }