[C] Fix output code formatting.

Author: denizevrenci

sbe-tool/src/main/java/uk/co/real_logic/sbe/generation/c/CGenerator.java

@@ -2179,7 +2179,7 @@ private void generateEnumProperty(
  "{\n" +
  "%3$s" +
  " return %1$s_%4$s;\n" +
- "}\n\n",
+ "}\n",
  enumName,
  propertyName,
  generateEnumFieldNotPresentCondition(token.version(), enumName),