drm/i915: remove redundant checks for a null fb pointer

A prior check and return when pointer fb is null makes
subsequent null checks on fb redundant.  Remove the redundant
null checks.

Addresses-Coverity: ("Logically dead code")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191210142349.333171-1-colin.king@canonical.com

drivers/gpu/drm/i915/i915_debugfs.c

@@ -2582,8 +2582,8 @@ static void intel_plane_hw_info(struct seq_file *m, struct intel_plane *plane)
 		       plane_state->hw.rotation);
 
 	seq_printf(m, "\t\thw: fb=%d,%s,%dx%d, visible=%s, src=" DRM_RECT_FP_FMT ", dst=" DRM_RECT_FMT ", rotation=%s\n",
-		   fb ? fb->base.id : 0, fb ? format_name.str : "n/a",
-		   fb ? fb->width : 0, fb ? fb->height : 0,
+		   fb->base.id, format_name.str,
+		   fb->width, fb->height,
 		   yesno(plane_state->uapi.visible),
 		   DRM_RECT_FP_ARG(&plane_state->uapi.src),
 		   DRM_RECT_ARG(&plane_state->uapi.dst),