Fix blank lines in help message

Print only one blank line between logical options groups.

src/scdtotp.c

@@ -49,25 +49,25 @@ found in a OpenPGP smartcard.\n\
   -v, --version         Display the version message.\n\
 ");
 
-    printf("\n\
+    printf("\
   -t, --time SECONDS    Generate OTP for the specified time\n\
                         (in seconds) instead of current time.\n\
   -s, --step N          Specify the time step factor\n\
                         (defualt is %d).\n\
   -d, --digits N        Specify number of digits to output\n\
                         (default is %d).\n\
-", DEFAULT_TIME_STEP, DEFAULT_DIGITS);
+\n", DEFAULT_TIME_STEP, DEFAULT_DIGITS);
 
-    puts("\n\
+    puts("\
   -m, --mac-algo ALG    Use the specified HMAC algorithm.\n\
                         ALG can be 'sha1' (default)',\n\
                         'sha256' or 'sha512'.\n\
 ");
 
-    printf("\n\
+    printf("\
   -n, --private-do N    Read key from private data object N\n\
                         (default is %d).\n\
-", DEFAULT_PRIVATE_DO);
+\n", DEFAULT_PRIVATE_DO);
 
     printf("Report bugs to <%s>.\n", PACKAGE_BUGREPORT);