tccgen: Avoid warnings in callers of the type_size() function.

Warnings reported in in x86_64-gen.c and arm-gen.c:

warning: ‘align’ may be used uninitialized in this function [-Wmaybe-uninitialized]

Signed-off-by: Detlef Riekenberg <wine.dev@web.de>

tccgen.c

@@ -3897,6 +3897,7 @@ ST_FUNC int type_size(CType *type, int *a)
             return PTR_SIZE;
         }
     } else if (IS_ENUM(type->t) && type->ref->c < 0) {
+        *a = 0;
         return -1; /* incomplete enum */
     } else if (bt == VT_LDOUBLE) {
         *a = LDOUBLE_ALIGN;