Remove exra whitespace from files (#189)

* Remove multiple newlines at the end of files
* Remove the whitespace from the end of lines

sched/environ/env_clearenv.c

@@ -78,4 +78,3 @@ int clearenv(void)
 }
 
 #endif /* CONFIG_DISABLE_ENVIRON */
-

sched/environ/env_getenvironptr.c

@@ -95,4 +95,3 @@ FAR char **get_environ_ptr(void)
 }
 
 #endif /* CONFIG_DISABLE_ENVIRON */
-

sched/environ/env_setenv.c

@@ -198,4 +198,3 @@ errout:
 }
 
 #endif /* CONFIG_DISABLE_ENVIRON */
-

sched/environ/environ.h

@@ -166,4 +166,3 @@ int env_removevar(FAR struct task_group_s *group, FAR char *pvar);
 
 #endif /* !CONFIG_DISABLE_ENVIRON */
 #endif /* __SCHED_ENVIRON_ENVIRON_H */
-