Fortran: force error on bad KIND specifier [PR88552]

gcc/fortran/ChangeLog:

	PR fortran/88552
	* decl.cc (gfc_match_kind_spec): Use error path on missing right
	parenthesis.
	(gfc_match_decl_type_spec): Use error return when an error occurred
	during matching a KIND specifier.

gcc/testsuite/ChangeLog:

	PR fortran/88552
	* gfortran.dg/pr88552.f90: New test.

gcc/fortran/decl.cc

@@ -3366,6 +3366,7 @@ close_brackets:
       else
 	gfc_error ("Missing right parenthesis at %C");
       m = MATCH_ERROR;
+      goto no_match;
     }
   else
      /* All tests passed.  */
@@ -4703,6 +4704,9 @@ get_kind:
     }
 
   m = gfc_match_kind_spec (ts, false);
+  if (m == MATCH_ERROR)
+    return MATCH_ERROR;
+
   if (m == MATCH_NO && ts->type != BT_CHARACTER)
     {
       m = gfc_match_old_kind_spec (ts);

gcc/testsuite/gfortran.dg/pr88552.f90

@@ -0,0 +1,6 @@
+! { dg-do compile }
+! PR fortran/88552
+! Contributed by G.Steinmetz
+
+integer(len((c)) :: n   ! { dg-error "must be CHARACTER" }
+end