[PATCH,rs6000] PR80103: Fix typo in test case

[Kelvin Nilsen]

While reviewing regression test results for a back port of the PR80103
patch, I discovered a typographic error in the test case.  This patch
corrects the error.

I have tested this fix on powerpc64le-unknown-linux-gnu with no
regressions.  Is this ok for trunk?

gcc/testsuite/ChangeLog:

2017-06-30  Kelvin Nilsen  <kel...@gcc.gnu.org>

        PR target/80103
        * gcc.target/powerpc/pr80103-1.c (b): Correct spelling of
        __attribute__.


Index: gcc/testsuite/gcc.target/powerpc/pr80103-1.c
===================================================================
--- gcc/testsuite/gcc.target/powerpc/pr80103-1.c        (revision 249798)
+++ gcc/testsuite/gcc.target/powerpc/pr80103-1.c        (working copy)
@@ -12,5 +12,5 @@
 int a;
 void b (__attribute__ ((__vector_size__ (16))) char c)
 {
-  a = ((__attributes__ ((__vector_size__ (2 * sizeof (long)))) long) c)[0];
+  a = ((__attribute__ ((__vector_size__ (2 * sizeof (long)))) long) c)[0];
 }