Add tests to C ref code

[gmaxwell]

I am in ur code optimizing ur statements

index e5b26ec..2dc56aa 100644
--- a/ref/c/segwit_addr.c
+++ b/ref/c/segwit_addr.c
@@ -52,11 +52,11 @@ int bech32_encode(char *output, const char *hrp, const uint8_t *data, size_t dat
     size_t i = 0;
     while (hrp[i] != 0) {
         if (hrp[i] >= 'A' && hrp[i] <= 'Z') return 0;
-        if (!(hrp[i] >> 5)) return 0;
+/*        if (!(hrp[i] >> 5)) return 0;*/
         chk = bech32_polymod_step(chk) ^ (hrp[i] >> 5);
         ++i;
     }
-    if (i + 7 + data_len > 90) return 0;
+/*    if (i + 7 + data_len > 90) return 0;*/
     chk = bech32_polymod_step(chk);
     while (*hrp != 0) {
         chk = bech32_polymod_step(chk) ^ (*hrp & 0x1f);
@@ -64,7 +64,7 @@ int bech32_encode(char *output, const char *hrp, const uint8_t *data, size_t dat
     }
     *(output++) = '1';
     for (i = 0; i < data_len; ++i) {
-        if (*data >> 5) return 0;
+/*        if (*data >> 5) return 0;*/
         chk = bech32_polymod_step(chk) ^ (*data);
         *(output++) = charset[*(data++)];
     }
@@ -93,7 +93,7 @@ int bech32_decode(char* hrp, uint8_t *data, size_t *data_len, const char *input)
         ++(*data_len);
     }
     hrp_len = input_len - (1 + *data_len);
-    if (hrp_len < 1 || *data_len < 6) {
+    if (hrp_len < 1 /*|| *data_len < 6*/) {
         return 0;
     }
     *(data_len) -= 6;
@@ -118,7 +118,7 @@ int bech32_decode(char* hrp, uint8_t *data, size_t *data_len, const char *input)
     }
     ++i;
     while (i < input_len) {
-        int v = (input[i] & 0x80) ? -1 : charset_rev[(int)input[i]];
+        int v = charset_rev[(int)input[i]]; /*(input[i] & 0x80) ? -1 : charset_rev[(int)input[i]];*/
         if (input[i] >= 'a' && input[i] <= 'z') have_lower = 1;
         if (input[i] >= 'A' && input[i] <= 'Z') have_upper = 1;
         if (v == -1) {
@@ -152,7 +152,7 @@ static int convert_bits(uint8_t* out, size_t* outlen, int outbits, const uint8_t
         if (bits) {
             out[(*outlen)++] = (val << (outbits - bits)) & maxv;
         }
-    } else if (((val << (outbits - bits)) & maxv) || bits >= inbits) {
+    } else if (((val << (outbits - bits)) & maxv) /*|| bits >= inbits*/) {
         return 0;
     }
     return 1;

[gmaxwell]

bits >= inbits padding branch still untested.

[sipa]

bits >= inbits padding branch still untested.

Fixed.

[gmaxwell]

ACK