drivers/net: Remove unnecessary returns from void function()s

This patch removes from drivers/net/ all the unnecessary
return; statements that precede the last closing brace of
void functions.

It does not remove the returns that are immediately
preceded by a label as gcc doesn't like that.

It also does not remove null void functions with return.

Done via:
$ grep -rP --include=*.[ch] -l "return;\n}" net/ | \
  xargs perl -i -e 'local $/ ; while (<>) { s/\n[ \t\n]+return;\n}/\n}/g; print; }'

with some cleanups by hand.

Compile tested x86 allmodconfig only.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ixgbe/ixgbe_main.c

@@ -1615,8 +1615,6 @@ static void ixgbe_set_itr_msix(struct ixgbe_q_vector *q_vector)
 
 		ixgbe_write_eitr(q_vector);
 	}
-
-	return;
 }
 
 static void ixgbe_check_fan_failure(struct ixgbe_adapter *adapter, u32 eicr)
@@ -2180,8 +2178,6 @@ static void ixgbe_set_itr(struct ixgbe_adapter *adapter)
 
 		ixgbe_write_eitr(q_vector);
 	}
-
-	return;
 }
 
 /**
@@ -4466,7 +4462,6 @@ static void ixgbe_reset_interrupt_capability(struct ixgbe_adapter *adapter)
 		adapter->flags &= ~IXGBE_FLAG_MSI_ENABLED;
 		pci_disable_msi(adapter->pdev);
 	}
-	return;
 }
 
 /**