Remove tabs after spaces in C comments

This was not changed in HEAD, but will be done later as part of a
pgindent run.  Future pgindent runs will also do this.

Report by Tom Lane

Backpatch through all supported branches, but not HEAD

src/port/snprintf.c

@@ -18,7 +18,7 @@
  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.	IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
@@ -66,7 +66,7 @@
  * platforms.  This implementation is compatible with the Single Unix Spec:
  *
  * 1. -1 is returned only if processing is abandoned due to an invalid
- * parameter, such as incorrect format string.	(Although not required by
+ * parameter, such as incorrect format string.  (Although not required by
  * the spec, this happens only when no characters have yet been transmitted
  * to the destination.)
  *
@@ -87,7 +87,7 @@
  * Original:
  * Patrick Powell Tue Apr 11 09:48:21 PDT 1995
  * A bombproof version of doprnt (dopr) included.
- * Sigh.  This sort of thing is always nasty do deal with.	Note that
+ * Sigh.  This sort of thing is always nasty do deal with.  Note that
  * the version here does not include floating point. (now it does ... tgl)
  **************************************************************/