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Remove redundant returns in cpp.c

These returns were there because in the past these functions
were bool functions, but it is a non sense now.

--- a/cc1/cpp.c

+++ b/cc1/cpp.c

@@ -377,7 +377,6 @@

 	for (t = s + strlen(s) + 1; isspace(*--t); *t = '\0')

 		/* nothing */;

 	sym->u.s = mkdefine(s);

-	return;

 }

 static void

@@ -459,7 +458,6 @@

 {

 	if (cppoff)

 		return;

-	return;

 }

 static void

@@ -486,8 +484,6 @@

 	sym = lookup(NS_CPP);

 	if (!(ifstatus[n] = (sym->flags & ISDEFINED) != 0 == isdef))

 		++cppoff;

-

-	return;

 }

 static void

@@ -510,7 +506,6 @@

 	cleanup(s);

 	if (!ifstatus[--numif])

 		--cppoff;

-	return;

 }

 static void