Fix a typo in hostConfig.ShmSize validation

Other places referring to the same configuration, including docs, have
the correct spelling.

Signed-off-by: Rodolfo Carvalho <rhcarvalho@gmail.com>

daemon/daemon_unix.go

@@ -525,7 +525,7 @@ func verifyPlatformContainerSettings(daemon *Daemon, hostConfig *containertypes.
 	warnings = append(warnings, w...)
 
 	if hostConfig.ShmSize < 0 {
-		return warnings, fmt.Errorf("SHM size must be greater then 0")
+		return warnings, fmt.Errorf("SHM size must be greater than 0")
 	}
 
 	if hostConfig.OomScoreAdj < -1000 || hostConfig.OomScoreAdj > 1000 {

integration-cli/docker_api_containers_test.go

@@ -1462,7 +1462,7 @@ func (s *DockerSuite) TestPostContainersCreateShmSizeNegative(c *check.C) {
 	status, body, err := sockRequest("POST", "/containers/create", config)
 	c.Assert(err, check.IsNil)
 	c.Assert(status, check.Equals, http.StatusInternalServerError)
-	c.Assert(string(body), checker.Contains, "SHM size must be greater then 0")
+	c.Assert(string(body), checker.Contains, "SHM size must be greater than 0")
 }
 
 func (s *DockerSuite) TestPostContainersCreateShmSizeHostConfigOmitted(c *check.C) {