Fix semop return type. Do some minor style-based fixes.

programs/tests/t_schedfb.c

@@ -19,4 +19,4 @@ int main(int argc, char *argv[])
     }
     while (wait(NULL) != -1) continue;
     return 0;
-}
+}

programs/tests/t_semflg.c

@@ -116,4 +116,4 @@ int main(int argc, char *argv[])
     printf("[father] Correctly removed semaphore set.\n");
 
     return 0;
-}
+}

programs/tests/t_semget.c

@@ -144,4 +144,4 @@ int main(int argc, char *argv[])
     printf("[father] Correctly removed semaphore set.\n");
 
     return 0;
-}
+}

programs/tests/t_semop.c

@@ -85,4 +85,4 @@ int main(int argc, char *argv[])
         return 1;
     }
     return 0;
-}
+}