Fix null pointer subtraction warning (#10498)
The warning: ``` pqsort.c:106:7: warning: performing pointer subtraction with a null pointer has undefined behavior [-Wnull-pointer-subtraction] loop: SWAPINIT(a, es); ^~~~~~~~~~~~~~~ pqsort.c:65:47: note: expanded from macro 'SWAPINIT' #define SWAPINIT(a, es) swaptype = ((char *)a - (char *)NULL) % sizeof(long) || \ ``` Clang version: ``` Apple clang version 13.1.6 (clang-1316.0.21.2) Target: x86_64-apple-darwin21.3.0 Thread model: posix InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin ``` (cherry picked from commit cb625844)
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