PG-286: Fix deadlock.

Can't call elog() function from inside the pgsm_log as the pgss_hash
lock could be already acquired in exclusive mode, since elog() triggers
the psmg_emit_log hook, when it calls pgss_store it will try to acquire
the pgss_hash lock again, leading to a deadlock.

pgsm_errors.c

@@ -96,9 +96,7 @@ void pgsm_log(PgsmLogSeverity severity, const char *format, ...)
 		LWLockRelease(pgss->errors_lock);
 		/* 
 		* We're out of memory, can't track this error message.
-		* In this case we must fallback to PostgreSQL log facility.
 		*/
-		elog(WARNING, "pgsm_log_error: <OUT OF MEMORY>");
 		return;
 	}