KVM: SVM: Make symbol 'svm_gp_erratum_intercept' static

The sparse tool complains as follows:

arch/x86/kvm/svm/svm.c:204:6: warning:
symbol 'svm_gp_erratum_intercept' was not declared. Should it be static?

This symbol is not used outside of svm.c, so this
commit marks it static.

Fixes: 82a11e9c6fa2b ("KVM: SVM: Add emulation support for #GP triggered by SVM instructions")
Reported-by: Hulk Robot <[e-mail]>
Signed-off-by: Wei Yongjun <[e-mail]>
Message-Id: <[e-mail]>
Signed-off-by: Paolo Bonzini <[e-mail]>

arch/x86/kvm/svm/svm.c

···
 bool __read_mostly dump_invalid_vmcb;
 module_param(dump_invalid_vmcb, bool, 0644);
 
-bool svm_gp_erratum_intercept = true;
+static bool svm_gp_erratum_intercept = true;
 
 static u8 rsm_ins_bytes[] = "\x0f\xaa";