accel: Fix typo and grammar in comment

The typo was found by codespell.
Signed-off-by: NStefan Weil <sw@weilnetz.de>
Message-Id: <20180712194454.26765-1-sw@weilnetz.de>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

accel/tcg/translate-all.c

@@ -1795,7 +1795,7 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
     tb->jmp_dest[0] = (uintptr_t)NULL;
     tb->jmp_dest[1] = (uintptr_t)NULL;
 
-    /* init original jump addresses wich has been set during tcg_gen_code() */
+    /* init original jump addresses which have been set during tcg_gen_code() */
     if (tb->jmp_reset_offset[0] != TB_JMP_RESET_OFFSET_INVALID) {
         tb_reset_jump(tb, 0);
     }