[AGPGART] Fix sparse warning in sgi-agp.c
[AGPGART] Fix sparse warning in sgi-agp.c

drivers/char/agp/sgi-agp.c:51:10: warning: Using plain integer as NULL pointer

Signed-off-by: Dave Jones <d5ec0d24602845f6f4b6a35ef729998d1fba5507@redhat.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas