[bug] perf_event_intel_uncore.c build warnings on allnoconfig

[Ingo Molnar]

FYI, on a 'make allnoconfig' x86_64 kernel I get a stream of 
warnings:

 arch/x86/kernel/cpu/perf_event_intel_uncore.c: In function âsnbep_uncore_pci_disable_boxâ:
 arch/x86/kernel/cpu/perf_event_intel_uncore.c:124:9: warning: âconfigâ is used uninitialized in this function [-Wuninitialized]
 arch/x86/kernel/cpu/perf_event_intel_uncore.c: In function âsnbep_uncore_pci_enable_boxâ:
 arch/x86/kernel/cpu/perf_event_intel_uncore.c:135:9: warning: âconfigâ is used uninitialized in this function [-Wuninitialized]
 arch/x86/kernel/cpu/perf_event_intel_uncore.c: In function âsnbep_uncore_pci_read_counterâ:
 arch/x86/kernel/cpu/perf_event_intel_uncore.c:164:2: warning: âcountâ is used uninitialized in this function [-Wuninitialized]

Please fix this - if pci_read_config_dword() returns an error it 
should be handled - that will fix these warnings as well.

Thanks,

	Ingo
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