drop some useless return statements

code/tools/lcc/cpp/cpp.c

@@ -250,7 +250,6 @@ control(Tokenrow *trp)
 		break;
 	}
 	setempty(trp);
-	return;
 }
 
 void *

code/tools/lcc/cpp/include.c

@@ -108,7 +108,6 @@ doinclude(Tokenrow *trp)
 	return;
 syntax:
 	error(ERROR, "Syntax error in #include");
-	return;
 }
 
 /*

code/tools/lcc/cpp/macro.c

@@ -218,7 +218,6 @@ expand(Tokenrow *trp, Nlist *np)
 	insertrow(trp, ntokc, &ntr);
 	trp->tp -= rowlen(&ntr);
 	dofree(ntr.bp);
-	return;
 }	
 
 /*