pmcstat(8): Fix a typo in an error message

- s/evalation/evaluation/

(cherry picked from commit 780a50c729)

usr.sbin/pmcstat/pmcstat.c

@@ -216,7 +216,7 @@ pmcstat_find_targets(const char *spec)
 			SLIST_INSERT_HEAD(&args.pa_targets, pt, pt_next);
 		} else if (rv != REG_NOMATCH) {
 			regerror(rv, &reg, errbuf, sizeof(errbuf));
-			errx(EX_SOFTWARE, "ERROR: Regex evalation failed: %s",
+			errx(EX_SOFTWARE, "ERROR: Regex evaluation failed: %s",
 			    errbuf);
 		}
 	}