[PATCHv2] x86: fix to parse multiboot command line passed by latest grub

[Wei Yongjun <yjwei@cn.fujitsu.com>]

latest grub had changed to "don't pass filename in multiboot
command line".

The old cmdline format is: "module-name options..."
The new cmdline format is: "options..."

So xen + grub2 always loss the first option, because xen will
skip the first option.

Since xen doesn't actually complain about unknown options, so
simply stop stripping the first option altogether, under grub1
Xen will just ignore it and under grub2 it won't be passed in.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>

diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -423,10 +423,6 @@
     p = p ? : "";
     while ( *p == ' ' )
         p++;
-    while ( (*p != ' ') && (*p != '\0') )
-        p++;
-    while ( *p == ' ' )
-        p++;
     return p;
 }