Fix extra semicolon outside of a function in NO_SANITIZE

Author: nobu

ext/bigdecimal/missing.c

@@ -15,7 +15,8 @@
     _Pragma("GCC diagnostic push") \
     _Pragma("GCC diagnostic ignored \"-Wattributes\"") \
     __attribute__((__no_sanitize__(x))) y; \
-    _Pragma("GCC diagnostic pop")
+    _Pragma("GCC diagnostic pop") \
+    y
 #endif
 
 #undef strtod