i40e: trivial fixes

Prevent some compiler warnings and implement some other
trivial fixes.

Change-Id: I7f49d79b91b94df1ad4a8306a0410ed72238845f
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Kavindya Deegala <kavindya.s.deegala@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/intel/i40e/i40e_diag.c b/drivers/net/ethernet/intel/i40e/i40e_diag.c
index dc6c41f..98c1ef5 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_diag.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_diag.c
@@ -119,7 +119,7 @@
 
 	/* read NVM control word and if NVM valid, validate EEPROM checksum*/
 	ret_code = i40e_read_nvm_word(hw, I40E_SR_NVM_CONTROL_WORD, &reg_val);
-	if ((!ret_code) &&
+	if (!ret_code &&
 	    ((reg_val & I40E_SR_CONTROL_WORD_1_MASK) ==
 	     (0x01 << I40E_SR_CONTROL_WORD_1_SHIFT))) {
 		ret_code = i40e_validate_nvm_checksum(hw, NULL);