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hexen/sv_save.c: revert 9e71dbb, fix fwrite check

The condition and message under fwrite() was a near-copy of the
corresponding fread() case: it now checks and displays correctly.

--- a/src/hexen/sv_save.c

+++ b/src/hexen/sv_save.c

@@ -3257,7 +3257,7 @@

     byte *buffer;

     int file_length, file_remaining;

     FILE *read_handle, *write_handle;

-    int buf_count, read_count;

+    int buf_count, read_count, write_count;

     read_handle = fopen(source_name, "rb");

     if (read_handle == NULL)

@@ -3300,9 +3300,10 @@

             I_Error ("Couldn't read file %s", source_name);

         }

-        if (read_count < buf_count)

+        write_count = fwrite(buffer, 1, buf_count, write_handle);

+        if (write_count < buf_count)

         {

-            I_Error ("Couldn't read file %s", dest_name);

+            I_Error ("Couldn't write to file %s", dest_name);

         }

         file_remaining -= buf_count;