* process.c (Fnetwork_interface_info): Avoid left-shift undefined

behavior with 1 << 31.  GCC 4.6.0 warns about this on 32-bit hosts.

src/ChangeLog

 2011-04-19  Paul Eggert  <eggert@cs.ucla.edu>
 
+	* process.c (Fnetwork_interface_info): Avoid left-shift undefined
+	behavior with 1 << 31.  GCC 4.6.0 warns about this on 32-bit hosts.
+
 	* xfns.c (Fx_window_property): Simplify a bit,
 	to make a bit faster and to avoid GCC 4.6.0 warning.
 	* xselect.c (x_get_window_property, x_handle_dnd_message): Likewise.

src/process.c

@@ -3723,9 +3723,9 @@ FLAGS is the current flags of the interface.  */)
 	      flags -= fp->flag_bit;
 	    }
 	}
-      for (fnum = 0; flags && fnum < 32; fnum++)
+      for (fnum = 0; flags && fnum < 32; flags >>= 1, fnum++)
 	{
-	  if (flags & (1 << fnum))
+	  if (flags & 1)
 	    {
 	      elt = Fcons (make_number (fnum), elt);
 	    }