linux-user: Use macro TARGET_NSIG_WORDS where possible

This improves readability and simplifies the code.

Cc: Riku Voipio <riku.voipio@iki.fi>
Signed-off-by: NStefan Weil <sw@weilnetz.de>
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

linux-user/signal.c

@@ -2539,9 +2539,9 @@ void sparc64_set_context(CPUSPARCState *env)
             abi_ulong *src, *dst;
             src = ucp->tuc_sigmask.sig;
             dst = target_set.sig;
-            for (i = 0; i < sizeof(target_sigset_t) / sizeof(abi_ulong);
-                 i++, dst++, src++)
+            for (i = 0; i < TARGET_NSIG_WORDS; i++, dst++, src++) {
                 err |= __get_user(*dst, src);
+            }
             if (err)
                 goto do_sigsegv;
         }
@@ -2644,9 +2644,9 @@ void sparc64_get_context(CPUSPARCState *env)
         abi_ulong *src, *dst;
         src = target_set.sig;
         dst = ucp->tuc_sigmask.sig;
-        for (i = 0; i < sizeof(target_sigset_t) / sizeof(abi_ulong);
-             i++, dst++, src++)
+        for (i = 0; i < TARGET_NSIG_WORDS; i++, dst++, src++) {
             err |= __put_user(*src, dst);
+        }
         if (err)
             goto do_sigsegv;
     }