[COMMITTED] S390: Fix non-ascii character in fenv.h.

[Stefan Liebler]

The comment "isn't" contained a non-ascii character which leads to
an error if compiled with -finput-charset=ascii:
error: failure to convert ascii to UTF-8

This is observable in GCC testsuite:
FAIL: 17_intro/headers/c++1998/charset.cc (test for excess errors)
FAIL: 17_intro/headers/c++2011/charset.cc (test for excess errors)
FAIL: 17_intro/headers/c++2014/charset.cc (test for excess errors)
FAIL: 17_intro/headers/c++2017/charset.cc (test for excess errors)
FAIL: 17_intro/headers/c++2020/charset.cc (test for excess errors)

Also rewrite the comment above.

Reported-by: Ulrich Weigand <Ulrich.Weigand@de.ibm.com>
---
 sysdeps/s390/fpu/bits/fenv.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sysdeps/s390/fpu/bits/fenv.h b/sysdeps/s390/fpu/bits/fenv.h
index 4038f96..e10d025 100644
--- a/sysdeps/s390/fpu/bits/fenv.h
+++ b/sysdeps/s390/fpu/bits/fenv.h
@@ -73,14 +73,14 @@ typedef unsigned int fexcept_t; /* size of fpc */
 
 
 /* Type representing floating-point environment.  This function corresponds
-   to the layout of the block written by the `fstenv'.  */
+   to the layout of the block used by fegetenv and fesetenv.  */
 typedef struct
 {
   fexcept_t __fpc;
   void *__unused;
   /* The field __unused (formerly __ieee_instruction_pointer) is a relict from
      commit "Remove PTRACE_PEEKUSER" (87b9b50f0d4b92248905e95a06a13c513dc45e59)
-     and isn´t used anymore.  */
+     and isn't used anymore.  */
 } fenv_t;
 
 /* If the default argument is used we use this value.  */
-- 
1.8.3.1