Refactor siglen_map[] to store key size in bytes instead of 32-bit words.

Review URL: http://codereview.chromium.org/660261
diff --git a/utils/file_keys.c b/utils/file_keys.c
index 2401a15..1aac93f 100644
--- a/utils/file_keys.c
+++ b/utils/file_keys.c
@@ -66,7 +66,7 @@
   int cmd_len;
   FILE* cmd_out;  /* File descriptor to command output. */
   uint8_t* signature = NULL;
-  int signature_size = siglen_map[algorithm] * sizeof(uint32_t);
+  int signature_size = siglen_map[algorithm];
 
   /* Build command line:
    * sign_data.sh <algorithm> <key file> <input file>