Fix PR85025: libgcc/config/i386/shadow-stack-unwind.h is wrong.

	PR target/85025
	* config/i386/shadow-stack-unwind.h (_Unwind_Frames_Extra):
	Fix a typo, tmp => 255.

From-SVN: r258763

libgcc/ChangeLog

+2018-03-22  Igor Tsimbalist  <igor.v.tsimbalist@intel.com>
+
+	PR target/85025
+	* config/i386/shadow-stack-unwind.h (_Unwind_Frames_Extra):
+	Fix a typo, tmp => 255.
+
 2018-03-20  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/84945

libgcc/config/i386/shadow-stack-unwind.h

@@ -42,7 +42,7 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 	  _Unwind_Word tmp = (x);		\
 	  while (tmp > 255)			\
 	    {					\
-	      _inc_ssp (tmp);			\
+	      _inc_ssp (255);			\
 	      tmp -= 255;			\
 	    }					\
 	  _inc_ssp (tmp);			\