Cleanup JBig2_ArithIntDecoder.

core/src/fxcodec/jbig2/JBig2_TrdProc.cpp

Index: core/src/fxcodec/jbig2/JBig2_TrdProc.cpp
diff --git a/core/src/fxcodec/jbig2/JBig2_TrdProc.cpp b/core/src/fxcodec/jbig2/JBig2_TrdProc.cpp
index afa3dba920fc4d3a07db759dc7ba4f7bc65f0105..9b457adf963a8693801998341312913af799a839 100644
--- a/core/src/fxcodec/jbig2/JBig2_TrdProc.cpp
+++ b/core/src/fxcodec/jbig2/JBig2_TrdProc.cpp
@@ -262,7 +262,7 @@ CJBig2_Image* CJBig2_TRDProc::decode_Arith(CJBig2_ArithDecoder* pArithDecoder,
   }
   nonstd::unique_ptr<CJBig2_Image> SBREG(new CJBig2_Image(SBW, SBH));
   SBREG->fill(SBDEFPIXEL);
-  if (IADT->decode(pArithDecoder, &STRIPT) == -1) {
+  if (!IADT->decode(pArithDecoder, &STRIPT)) {
     goto failed;
   }
   STRIPT *= SBSTRIPS;
@@ -270,7 +270,7 @@ CJBig2_Image* CJBig2_TRDProc::decode_Arith(CJBig2_ArithDecoder* pArithDecoder,
   FIRSTS = 0;
   NINSTANCES = 0;
   while (NINSTANCES < SBNUMINSTANCES) {
-    if (IADT->decode(pArithDecoder, &DT) == -1) {
+    if (!IADT->decode(pArithDecoder, &DT)) {
       goto failed;
     }
     DT *= SBSTRIPS;
@@ -278,7 +278,7 @@ CJBig2_Image* CJBig2_TRDProc::decode_Arith(CJBig2_ArithDecoder* pArithDecoder,
     bFirst = TRUE;
     for (;;) {
       if (bFirst) {
-        if (IAFS->decode(pArithDecoder, &DFS) == -1) {
+        if (!IAFS->decode(pArithDecoder, &DFS)) {
           goto failed;
         }
         FIRSTS = FIRSTS + DFS;
@@ -300,15 +300,13 @@ CJBig2_Image* CJBig2_TRDProc::decode_Arith(CJBig2_ArithDecoder* pArithDecoder,
       if (SBSTRIPS == 1) {
         CURT = 0;
       } else {
-        if (IAIT->decode(pArithDecoder, &nVal) == -1) {
+        if (!IAIT->decode(pArithDecoder, &nVal)) {
           goto failed;
         }
         CURT = nVal;
       }
       TI = STRIPT + CURT;
-      if (IAID->decode(pArithDecoder, &nVal) == -1) {
-        goto failed;
-      }
+      IAID->decode(pArithDecoder, &nVal);
       IDI = nVal;
       if (IDI >= SBNUMSYMS) {
         goto failed;
@@ -316,7 +314,7 @@ CJBig2_Image* CJBig2_TRDProc::decode_Arith(CJBig2_ArithDecoder* pArithDecoder,
       if (SBREFINE == 0) {
         RI = 0;
       } else {
-        if (IARI->decode(pArithDecoder, &RI) == -1) {
+        if (!IARI->decode(pArithDecoder, &RI)) {
           goto failed;
         }
       }
@@ -326,10 +324,10 @@ CJBig2_Image* CJBig2_TRDProc::decode_Arith(CJBig2_ArithDecoder* pArithDecoder,
       if (RI == 0) {
         IBI = SBSYMS[IDI];
       } else {
-        if ((IARDW->decode(pArithDecoder, &RDWI) == -1) ||
-            (IARDH->decode(pArithDecoder, &RDHI) == -1) ||
-            (IARDX->decode(pArithDecoder, &RDXI) == -1) ||
-            (IARDY->decode(pArithDecoder, &RDYI) == -1)) {
+        if (!IARDW->decode(pArithDecoder, &RDWI) ||
+            !IARDH->decode(pArithDecoder, &RDHI) ||
+            !IARDX->decode(pArithDecoder, &RDXI) ||
+            !IARDY->decode(pArithDecoder, &RDYI)) {
           goto failed;
         }
         IBOI = SBSYMS[IDI];