enable gocritic linter

The linter ensures a common code style.
- use switch/case instead of else if
- use if instead of switch/case for single case statement
- add space between comment and text
- detect the use of defer with os.Exit()
- use short form var += "..." instead of var = var + "..."
- detect problems with append()
```
newSlice := append(orgSlice, val)
```
  This could lead to nasty bugs because the orgSlice will be changed in
  place if it has enough capacity too hold the new elements. Thus we
  newSlice might not be a copy.

Of course most of the changes are just cosmetic and do not cause any
logic errors but I think it is a good idea to enforce a common style.
This should help maintainability.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

3 files changed, 3 insertions, 3 deletions

diff --git a/pkg/domain/entities/containers.go b/pkg/domain/entities/containers.go
index ae60e5b96..1db8b9951 100644
--- a/pkg/domain/entities/containers.go
+++ b/pkg/domain/entities/containers.go
@@ -385,7 +385,7 @@ type ContainerInitReport struct {
 	Id  string //nolint
 }
 
-//ContainerMountOptions describes the input values for mounting containers
+// ContainerMountOptions describes the input values for mounting containers
 // in the CLI
 type ContainerMountOptions struct {
 	All        bool
diff --git a/pkg/domain/entities/network.go b/pkg/domain/entities/network.go
index 134ad126a..0f901c7f1 100644
--- a/pkg/domain/entities/network.go
+++ b/pkg/domain/entities/network.go
@@ -33,7 +33,7 @@ type NetworkRmOptions struct {
 	Timeout *uint
 }
 
-//NetworkRmReport describes the results of network removal
+// NetworkRmReport describes the results of network removal
 type NetworkRmReport struct {
 	Name string
 	Err  error
diff --git a/pkg/domain/entities/reports/prune.go b/pkg/domain/entities/reports/prune.go
index 219e35b67..497e5d606 100644
--- a/pkg/domain/entities/reports/prune.go
+++ b/pkg/domain/entities/reports/prune.go
@@ -34,7 +34,7 @@ func PruneReportsSize(r []*PruneReport) uint64 {
 		if v == nil {
 			continue
 		}
-		size = size + v.Size
+		size += v.Size
 	}
 	return size
 }