s390x/mmu: Remove duplicate check for MMU_DATA_STORE

No need to double-check if we have a write.

Found by Coverity (CID: 1406404).

Fixes: 31b5941 ("target/s390x: Return exception from mmu_translate_real")
Cc: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20191017121922.18840-1-david@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

target/s390x/mmu_helper.c

@@ -556,9 +556,7 @@ int mmu_translate_real(CPUS390XState *env, target_ulong raddr, int rw,
         *flags |= PAGE_WRITE_INV;
         if (is_low_address(raddr) && rw == MMU_DATA_STORE) {
             /* LAP sets bit 56 */
-            *tec = (raddr & TARGET_PAGE_MASK)
-                 | (rw == MMU_DATA_STORE ? FS_WRITE : FS_READ)
-                 | 0x80;
+            *tec = (raddr & TARGET_PAGE_MASK) | FS_WRITE | 0x80;
             return PGM_PROTECTION;
         }
     }