linux-user/sparc: Remove unneeded checks of 'err' from sparc64_get_context()

Unlike the kernel macros, our __get_user() and __put_user() do not
return a failure code.  Kernel code typically has a style of
  err |= __get_user(...); err |= __get_user(...);
and then checking err at the end.  In sparc64_get_context() our
version of the code dropped the accumulating into err but left the
"if (err) goto do_sigsegv" checks, which will never be taken. Delete
unnecessary if()s.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20201106152738.26026-3-peter.maydell@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

linux-user/sparc/signal.c

@@ -555,8 +555,6 @@ void sparc64_get_context(CPUSPARCState *env)
         for (i = 0; i < TARGET_NSIG_WORDS; i++, dst++, src++) {
             __put_user(*src, dst);
         }
-        if (err)
-            goto do_sigsegv;
     }
 
     /* XXX: tstate must be saved properly */
@@ -598,8 +596,6 @@ void sparc64_get_context(CPUSPARCState *env)
      * hidden behind an "if (fenab)" where fenab is always 0).
      */
 
-    if (err)
-        goto do_sigsegv;
     unlock_user_struct(ucp, ucp_addr, 1);
     return;
 do_sigsegv: