e1000e: Cleanup checkpatch extra space

Fixing "WARNING:SPACING: Unnecessary space before function pointer arguments"
Signed-off-by: Dave Ertman <davidx.m.ertman@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/e1000e/e1000.h

@@ -265,9 +265,9 @@ struct e1000_adapter {
 	u32 tx_hwtstamp_timeouts;
 
 	/* Rx */
-	bool (*clean_rx) (struct e1000_ring *ring, int *work_done,
+	bool (*clean_rx)(struct e1000_ring *ring, int *work_done,
 			 int work_to_do) ____cacheline_aligned_in_smp;
-	void (*alloc_rx_buf) (struct e1000_ring *ring, int cleaned_count,
+	void (*alloc_rx_buf)(struct e1000_ring *ring, int cleaned_count,
 			     gfp_t gfp);
 	struct e1000_ring *rx_ring;