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jbig2dec: Directly return jbig2_error(FATAL); they indicate errors.

Because jbig2_error(ctx, JBIG2_SEVERITY_FATAL, ...) returns -1,
it can be immediately returned or assigned as a return code.

--- a/jbig2_huffman.c

+++ b/jbig2_huffman.c

@@ -228,9 +228,8 @@

     int32_t result;

     if (hs->offset_limit && hs->offset >= hs->offset_limit) {

-        jbig2_error(hs->ctx, JBIG2_SEVERITY_FATAL, -1, "end of jbig2 buffer reached at offset %d", hs->offset);

         *err = -1;

-        return -1;

+        return jbig2_error(hs->ctx, JBIG2_SEVERITY_FATAL, -1, "end of jbig2 buffer reached at offset %d", hs->offset);

     }

     result = this_word >> (32 - bits);

@@ -264,10 +263,9 @@

     int32_t result;

     if (hs->offset_limit && hs->offset >= hs->offset_limit) {

-        jbig2_error(hs->ctx, JBIG2_SEVERITY_FATAL, -1, "end of Jbig2WordStream reached at offset %d", hs->offset);

         if (oob)

             *oob = -1;

-        return -1;

+        return jbig2_error(hs->ctx, JBIG2_SEVERITY_FATAL, -1, "end of Jbig2WordStream reached at offset %d", hs->offset);

     }

     for (;;) {

--- a/jbig2_metadata.c

+++ b/jbig2_metadata.c

@@ -98,10 +98,8 @@

         keys = jbig2_renew(ctx, md->keys, char *, md->max_entries);

         values = jbig2_renew(ctx, md->values, char *, md->max_entries);

-        if (keys == NULL || values == NULL) {

-            jbig2_error(ctx, JBIG2_SEVERITY_FATAL, -1, "unable to resize metadata structure");

-            return -1;

-        }

+        if (keys == NULL || values == NULL)

+            return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, -1, "unable to resize metadata structure");

         md->keys = keys;

         md->values = values;

     }

--- a/jbig2_text.c

+++ b/jbig2_text.c

@@ -119,8 +119,7 @@

         runcodeparams.n_lines = 35;

         runcodes = jbig2_build_huffman_table(ctx, &runcodeparams);

         if (runcodes == NULL) {

-            jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number, "error constructing symbol id runcode table");

-            code = -1;

+            code = jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number, "error constructing symbol id runcode table");

             goto cleanup1;

         }

@@ -127,8 +126,7 @@

         /* decode the symbol id code lengths using the runlength table */

         symcodelengths = jbig2_new(ctx, Jbig2HuffmanLine, SBNUMSYMS);

         if (symcodelengths == NULL) {

-            jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number, "memory allocation failure reading symbol ID huffman table");

-            code = -1;

+            code = jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number, "memory allocation failure reading symbol ID huffman table");

             goto cleanup1;

         }

         index = 0;

@@ -146,8 +144,7 @@

             } else {

                 if (code == 32) {

                     if (index < 1) {

-                        jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number, "error decoding symbol id table: run length with no antecedent");

-                        code = -1;

+                        code = jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number, "error decoding symbol id table: run length with no antecedent");

                         goto cleanup1;

                     }

                     len = symcodelengths[index - 1].PREFLEN;