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Change a complex if sequence for a switch

We were testing the value of a variable against different cases
and switch does a better work in these kind of cases, so changeit.

--- a/decl.c

+++ b/decl.c

@@ -327,7 +327,8 @@

 	} else if (accept(';')) {

 		register unsigned char type = base->type;

-		if (type == STRUCT || type == UNION || type == ENUM) {

+		switch (type) {

+		case STRUCT: case UNION: case ENUM:

 			if (HAS_STORAGE(base) || HAS_QUALIF(base)) {

 				warn(options.useless,

 				     "useless storage class specifier in empty declaration");

@@ -336,7 +337,7 @@

 				warn(options.useless,

 				     "unnamed struct/union that defines no instances");

 			}

-		} else {

+		default:

 			warn(options.useless,

 			     "useless type name in empty declaration");

 		}

-- 

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