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sphere: avoid integer underflow

--- a/src/sphere.c

+++ b/src/sphere.c

@@ -63,7 +63,8 @@

     return (SOX_EOF);

   }

-  header_size -= (strlen(buf) + 1);

+  bytes_read = strlen(buf);

+  header_size -= bytes_read >= header_size ? header_size : bytes_read + 1;

   while (strncmp(buf, "end_head", (size_t)8) != 0) {

     if (strncmp(buf, "sample_n_bytes", (size_t)14) == 0)

@@ -105,7 +106,8 @@

       return (SOX_EOF);

     }

-    header_size -= (strlen(buf) + 1);

+    bytes_read = strlen(buf);

+    header_size -= bytes_read >= header_size ? header_size : bytes_read + 1;

   }

   if (!bytes_per_sample)