[patch] A bit more better fix in can_unload_buffer()

[h_east]

Hi Bram,

An attached patch is related to 8.1.0342.
https://github.com/vim/vim/commit/94f01956a583223dafe24135489d0ab1100ab0ad#diff-a4fc02df73c5e2af124168e5b1436d00R429

It gets a little faster :-)
--
Best regards,
Hirohito Higashi (h_east)

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diff --git a/src/buffer.c b/src/buffer.c
index b536be64b..bd5621822 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -428,7 +428,10 @@ can_unload_buffer(buf_T *buf)
 
 	FOR_ALL_WINDOWS(wp)
 	    if (wp->w_buffer == buf)
+	    {
 		can_unload = FALSE;
+		break;
+	    }
     }
     if (!can_unload)
 	EMSG(_("E937: Attempt to delete a buffer that is in use"));