Return the proper error code in SkBmpRLECodec

src/codec/SkBmpRLECodec.cpp

Index: src/codec/SkBmpRLECodec.cpp
diff --git a/src/codec/SkBmpRLECodec.cpp b/src/codec/SkBmpRLECodec.cpp
index 1b95acc830eb5178ef600de9ad5e48535b032f00..793bbfd2609e3bf139ec79795f7087b8d79f330d 100644
--- a/src/codec/SkBmpRLECodec.cpp
+++ b/src/codec/SkBmpRLECodec.cpp
@@ -287,7 +287,7 @@ SkCodec::Result SkBmpRLECodec::prepareToDecode(const SkImageInfo& dstInfo,
     fRLEBytes = fOrigRLEBytes;
     if (!this->initializeStreamBuffer()) {
         SkCodecPrintf("Error: cannot initialize stream buffer.\n");
-        return SkCodec::kInvalidConversion;
+        return SkCodec::kInvalidInput;
     }
 
     return SkCodec::kSuccess;