mg.c: Fix U32-to-bool assignment

This was caused by 3805b5fb04.  This commit restores the !=0 that
was there before 2fd13eccf0.

Thanks to Steve Hay for helping to track down the smoke failures.

1 files changed, 1 insertions, 1 deletions

diff --git a/mg.c b/mg.c
index 0ce58ab5d2..57411810af 100644
--- a/mg.c
+++ b/mg.c
@@ -116,7 +116,7 @@ S_save_magic_flags(pTHX_ I32 mgs_ix, SV *sv, U32 flags)
     mgs = SSPTR(mgs_ix, MGS*);
     mgs->mgs_sv = sv;
     mgs->mgs_magical = SvMAGICAL(sv);
-    mgs->mgs_readonly = SvREADONLY(sv);
+    mgs->mgs_readonly = SvREADONLY(sv) != 0;
     mgs->mgs_ss_ix = PL_savestack_ix;   /* points after the saved destructor */
     mgs->mgs_bumped = bumped;