Use off_t instead of __off_t

__off_t is an internal C library type, which shouldn't be used by
applications. It is not defined by the musl C library, so use the
public off_t type instead.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Index: b/ftpfs.c
===================================================================
--- a/ftpfs.c
+++ b/ftpfs.c
@@ -687,7 +687,7 @@
 	return ftpfs_getattr(path, &sbuf);
 }
 
-static __off_t test_size(const char* path)
+static off_t test_size(const char* path)
 {
 	struct stat sbuf;
 	int err = ftpfs_getattr(path, &sbuf);
@@ -950,7 +950,7 @@
 
   /* fix openoffice problem, truncating exactly to file length */
   
-  __off_t size = (long long int)test_size(path); 
+  off_t size = (long long int)test_size(path); 
   DEBUG(1, "ftpfs_truncate: %s check filesize=%lld\n", path, (long long int)size);
   
   if (offset == size)  
@@ -978,7 +978,7 @@
   }
   /* fix openoffice problem, truncating exactly to file length */
   
-  __off_t size = test_size(path); 
+  off_t size = test_size(path); 
   DEBUG(1, "ftpfs_ftruncate: %s check filesize=%lld\n", path, (long long int)size);
   
   if (offset == size)