[demo.c] Fix silent app failures due to zero exit code even on failures

By convention, an exit status of 0 signifies successful completion, while any
non-zero value typically indicates an error or a specific condition. In shell
scripting, the exit status of the last executed command can be accessed using
the special variable $?.

Signed-off-by: Imran Desai <[email protected]>

Author: idesai

demo.c

@@ -388,7 +388,7 @@ static int keygen(const char *keyname, const char *parm_set) {
         if (!aux_filename) {
             fprintf( stderr, "Warning: malloc failure writing to aux file\n" );
             free(aux);
-            return 1;
+            return 0;
         }
         sprintf( aux_filename, "%s.aux", keyname );
 
@@ -885,15 +885,15 @@ int main(int argc, char **argv) {
             if ((s = check_prefix( argv[i], "seed=" ))) {
                 if (seedbits) {
                     printf( "Error: seed specified twice\n" );
-                    return 0;
+                    return 1;
                 }
                 seedbits = s;
                 continue;
             }
             if ((s = check_prefix( argv[i], "i=" ))) {
                 if (i_value) {
                     printf( "Error: i specified twice\n" );
-                    return 0;
+                    return 1;
                 }
                 i_value = s;
                 continue;
@@ -908,53 +908,57 @@ int main(int argc, char **argv) {
             }
             printf( "Error: unexpected argument after parmset\n" );
             usage(argv[0]);
-            return 0;
+            return 1;
         }
         if (!keyname) {
             printf( "Error: missing keyname argument\n" );
             usage(argv[0]);
-            return 0;
+            return 1;
         }
         if (!seedbits != !i_value) {
             printf( "Error: must either specified both seed and i, or neither\n" );
-            return 0;
+            return 1;
         }
 
         if (!keygen( keyname, parmname )) {
             printf( "Error creating keys\n" );
+            return 1;
         }
         return 0;
     }
     if (0 == strcmp( argv[1], "sign" )) {
         if (argc < 4) {
             printf( "Error: mssing keyname and file argument\n" );
             usage(argv[0]);
-            return 0;
+            return 1;
         }
         if (!sign( argv[2], &argv[3] )) {
             printf( "Error signing\n" );
+            return 1;
         }
         return 0;
     }
     if (0 == strcmp( argv[1], "verify" )) {
         if (argc < 4) {
             printf( "Error: mssing keyname and file argument\n" );
             usage(argv[0]);
-            return 0;
+            return 1;
         }
         if (!verify( argv[2], &argv[3] )) {
             printf( "Error verifying\n" );
+            return 1;
         }
         return 0;
     }
     if (0 == strcmp( argv[1], "advance" )) {
         if (argc != 4) {
             printf( "Error: mssing amount to device the file\n" );
             usage(argv[0]);
-            return 0;
+            return 1;
         }
         if (!advance( argv[2], argv[3] )) {
             printf( "Error advancing\n" );
+            return 1;
         }
         return 0;
     }