BZ 1848995 - Intermittent pminfo crashes (core dumps)

51bb36a84 libpcp: minor clarification to previous fix to use __pmHashInit

d0df00ad1 derive_parser.y.in: fix of incomplete initialization of __pmHashCtl struct for F_REGEX node

diff --git a/src/libpcp/src/derive_parser.y.in b/src/libpcp/src/derive_parser.y.in

index 9ed375e01..6756daa77 100644

--- a/src/libpcp/src/derive_parser.y.in

+++ b/src/libpcp/src/derive_parser.y.in

@@ -2598,6 +2598,8 @@ regexpr	: opt_bang L_PATTERN

 		      return -1;

 		  }

 		  np->data.pattern->invert = $1;

+		  np->data.pattern->used = 0;

+		  __pmHashInit(&np->data.pattern->hash);

 		  $$ = np;

 		}