Bugfix: string pointer dereferencing in psadwatchd.c

[pillarsdotnet]

While compiling psad for Ubuntu, I noticed the following warning:

psadwatchd.c: In function ‘exec_binary’:
psadwatchd.c:393:30: warning: comparison between pointer and zero character constant [-Wpointer-compare]
                     && index != '\0' && *index != '\n') {
                              ^~
psadwatchd.c:393:24: note: did you mean to dereference the pointer?
                     && index != '\0' && *index != '\n') {
                        ^

From inspection of the code, it would appear that index should be *index in the above code.

This patch fixes the problem, and also adjusts alignment to clarify the intent.