drm/nouveau/fb: fix null derefs in nv49 and nv4e init
Commit dceef5d8 (drm/nouveau/fb: initialise vram controller as pfb sub-object) moved some code around and introduced these null derefs. pfb->ram is set to the new ram object outside of this ctor. Reported-by: NRonald Uitermark <ronald645@gmail.com> Tested-by: NRonald Uitermark <ronald645@gmail.com> Signed-off-by: NIlia Mirkin <imirkin@alum.mit.edu> Signed-off-by: NBen Skeggs <bskeggs@redhat.com>
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