Correct typos in source code.

Author: DimitriPapadopoulos

contrib/minizip/unzip.c

@@ -497,7 +497,7 @@ local unzFile unzOpenInternal(const void *path,
     ZPOS64_T central_pos;
     uLong   uL;
 
-    uLong number_disk;          /* number of the current dist, used for
+    uLong number_disk;          /* number of the current disk, used for
                                    spanning ZIP, unsupported, always 0*/
     uLong number_disk_with_CD;  /* number the disk with central dir, used
                                    for spanning ZIP, unsupported, always 0*/

contrib/puff/puff.c

@@ -593,10 +593,10 @@ local int fixed(struct state *s)
  *   provided for each of the literal/length symbols, and for each of the
  *   distance symbols.
  *
- * - If a symbol is not used in the block, this is represented by a zero as
- *   as the code length.  This does not mean a zero-length code, but rather
- *   that no code should be created for this symbol.  There is no way in the
- *   deflate format to represent a zero-length code.
+ * - If a symbol is not used in the block, this is represented by a zero as the
+ *   code length.  This does not mean a zero-length code, but rather that no
+ *   code should be created for this symbol.  There is no way in the deflate
+ *   format to represent a zero-length code.
  *
  * - The maximum number of bits in a code is 15, so the possible lengths for
  *   any code are 1..15.

test/minigzip.c

@@ -303,7 +303,7 @@ static void error(const char *msg) {
 #ifdef USE_MMAP /* MMAP version, Miguel Albrecht <malbrech@eso.org> */
 
 /* Try compressing the input file at once using mmap. Return Z_OK if
- * if success, Z_ERRNO otherwise.
+ * success, Z_ERRNO otherwise.
  */
 static int gz_compress_mmap(FILE *in, gzFile out) {
     int len;