minor gcc4 fixes

[Jerone Young <jyoung5@us.ibm.com>]

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These patches initialize unsigned longs that are used in xen. GCC4
complains about using unsigned longs that are not initialized before
use.

Signed-off-by: Jerone Young <jyoung5@us.ibm.com>
-- 
Jerone Young
IBM Linux Technology Center
jyoung5@us.ibm.com
512-838-1157 (T/L: 678-1157)

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--- xen/common/grant_table.c.old	2005-04-11 12:02:40.000000000 -0500
+++ xen/common/grant_table.c	2005-04-11 12:03:37.000000000 -0500
@@ -311,7 +311,8 @@ __gnttab_map_grant_ref(
     struct exec_domain   *led;
     u16                   dev_hst_ro_flags;
     int                   handle;
-    unsigned long         frame, host_virt_addr;
+    unsigned long         host_virt_addr = 0;
+    unsigned long         frame = 0;
     int                   rc;
 
     /* Returns 0 if TLB flush / invalidate required by caller.

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--- xen/arch/x86/shadow.c.old	2005-04-11 12:04:20.000000000 -0500
+++ xen/arch/x86/shadow.c	2005-04-11 12:05:41.000000000 -0500
@@ -1594,7 +1594,8 @@ static inline unsigned long
 shadow_make_snapshot(
     struct domain *d, unsigned long gpfn, unsigned long gmfn)
 {
-    unsigned long smfn, sl1mfn;
+    unsigned long smfn = 0; 
+    unsigned long sl1mfn = 0;
     void *original, *snapshot;
     u32 min_max = 0;
     int min, max, length;

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