x86/platform/uv: Fix missing checks of kcalloc() return values

Handle potential errors returned from kcalloc().

 [ bp: rewrite commit message. ]

Signed-off-by: Kangjie Lu <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Cc: Andrew Banman <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: Colin Ian King <[email protected]>
Cc: Darren Hart <[email protected]>
Cc: "Gustavo A. R. Silva" <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Mike Travis <[email protected]>
Cc: Nicolai Stange <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Thomas Gleixner <[email protected]>
Cc: Varsha Rao <[email protected]>
Cc: x86-ml <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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