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Bug 49659. Added check to avoid null pointer deref.
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@ -776,6 +776,7 @@ NS_IMETHODIMP nsChromeRegistry::GetStyleSheets(nsIURI *aChromeURL, nsISupportsAr
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nsCOMPtr<nsISimpleEnumerator> sheets;
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nsresult rv = GetDynamicInfo(aChromeURL, PR_FALSE, getter_AddRefs(sheets));
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if (NS_FAILED(rv)) return rv;
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PRBool hasMore;
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rv = sheets->HasMoreElements(&hasMore);
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if (NS_FAILED(rv)) return rv;
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@ -776,6 +776,7 @@ NS_IMETHODIMP nsChromeRegistry::GetStyleSheets(nsIURI *aChromeURL, nsISupportsAr
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nsCOMPtr<nsISimpleEnumerator> sheets;
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nsresult rv = GetDynamicInfo(aChromeURL, PR_FALSE, getter_AddRefs(sheets));
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if (NS_FAILED(rv)) return rv;
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PRBool hasMore;
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rv = sheets->HasMoreElements(&hasMore);
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if (NS_FAILED(rv)) return rv;
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