mountinfo: fix QF1001 (staticcheck)

	Error: mountinfo/mounted_linux_test.go:282:6: QF1001: could apply De Morgan's law (staticcheck)
			if !(tc.isNotExist && errors.Is(err, os.ErrNotExist)) {
			   ^
	Error: mountinfo/mounted_linux_test.go:353:8: QF1001: could apply De Morgan's law (staticcheck)
					if !(tc.isNotExist && errors.Is(err, os.ErrNotExist)) {
					   ^

Signed-off-by: Sebastiaan van Stijn <[email protected]>

Author: thaJeztah

Diff for: mountinfo/mounted_linux_test.go

@@ -279,7 +279,7 @@ func testMountedFast(t *testing.T, path string, tc *testMount, openat2Supported
 	mounted, sure, err := MountedFast(path)
 	if err != nil {
 		// Got an error; is it expected?
-		if !(tc.isNotExist && errors.Is(err, os.ErrNotExist)) {
+		if !tc.isNotExist || !errors.Is(err, os.ErrNotExist) {
 			t.Errorf("MountedFast: unexpected error: %v", err)
 		}
 
@@ -350,7 +350,7 @@ func TestMountedBy(t *testing.T) {
 				}
 			} else {
 				// Got an error; is it expected?
-				if !(tc.isNotExist && errors.Is(err, os.ErrNotExist)) {
+				if !tc.isNotExist || !errors.Is(err, os.ErrNotExist) {
 					t.Errorf("Mounted: unexpected error: %v", err)
 				}
 				// Check false is returned in error case.