fix short unsigned C declarations

Author: totalspectrum

Changelog.txt

@@ -1,5 +1,6 @@
 Version 7.2.1
 - Use _rxpin as repository to hold frequency for gbrk debug
+- Fixed "short unsigned" declarations in C
 
 Version 7.2.0
 - Add _[n] syntax for skipping assignments in Spin2

frontends/c/cgram.y

@@ -285,6 +285,12 @@ CombineTypes(AST *first, AST *second, AST **identifier, Module **module)
         second->left = first;
         return second;
     default:
+        if (first && second && first == ast_type_signed_word) {
+            if (TypeSize(second) == 4 && IsUnsignedType(second)) {
+                second = DupAST(ast_type_word);
+                first = NULL;
+            }
+        }
         if (!first) {
             return MergePrefix(prefix, second);
         }