drm/i915/gem: drop unused but set variable unpinned

Prepare for re-enabling -Wunused-but-set-variable.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/6831c21567e8e84da424f32a8b7b48932803ab7b.1685119007.git.jani.nikula@intel.com

Author: jnikula

drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c

@@ -736,7 +736,6 @@ static int eb_reserve(struct i915_execbuffer *eb)
 	struct eb_vma *ev;
 	unsigned int pass;
 	int err = 0;
-	bool unpinned;
 
 	/*
 	 * We have one more buffers that we couldn't bind, which could be due to
@@ -776,7 +775,7 @@ static int eb_reserve(struct i915_execbuffer *eb)
 			pin_flags |= PIN_NONBLOCK;
 
 		if (pass >= 1)
-			unpinned = eb_unbind(eb, pass >= 2);
+			eb_unbind(eb, pass >= 2);
 
 		if (pass == 2) {
 			err = mutex_lock_interruptible(&eb->context->vm->mutex);