Fixing some compilation errors that didn't show up in 'make test' for some reason

mig-agent/agentcontext/env_linux.go

@@ -94,7 +94,7 @@ func getIdent() (string, error) {
 			name:       "getLSBRelease",
 			successLog: "using lsb release for distribution ident",
 			findFn:     getLSBRelease,
-			validateFn: func(_ string, err error) { return err != nil },
+			validateFn: func(_ string, err error) bool { return err != nil },
 		},
 		{
 			// Here we check that we read more than '\S'.
@@ -102,13 +102,13 @@ func getIdent() (string, error) {
 			name:       "getIssue",
 			successLog: "using /etc/issue for distribution ident",
 			findFn:     getIssue,
-			validateFn: func(issueName string, err error) { return err != nil && len(issueName) > 3 },
+			validateFn: func(issueName string, err error) bool { return err != nil && len(issueName) > 3 },
 		},
 		{
 			name:       "getOSRelease",
 			successLog: "using /etc/os-release for distribution ident",
 			findFn:     getOSRelease,
-			validateFn: func(_ string, err error) { return err != nil },
+			validateFn: func(_ string, err error) bool { return err != nil },
 		},
 	}
 
@@ -118,7 +118,7 @@ func getIdent() (string, error) {
 			logChan <- mig.Log{Desc: findMethod.successLog}.Debug()
 			return ident, nil
 		}
-		logChan <- mig.Log{Desc: fmt.Errorf("%s failed: %v", findMethod.name, err)}.Debug()
+		logChan <- mig.Log{Desc: fmt.Sprintf("%s failed: %v", findMethod.name, err)}.Debug()
 	}
 
 	return "", fmt.Errorf("none of the configured methods for detecting the host's ident worked")