fix: make function "number of arguments" property warnings non-fatal

Previously, these warnings caused FORM to terminate with a failure
status.

Author: tueda

check/fixes.frm

@@ -4440,9 +4440,12 @@ assert result("testCF3") =~ expr("d(mu2,mu1,mu3)*e(mu2,mu1,mu3)*f(mu2,mu1,mu3)")
 *--#[ Issue766 :
 * Unintended "&" in some warning messages
 CF f(s,s);
+CF f>=x<=x;
 ModuleOption local,$a;
 .end
+assert return_value == 0
 assert warning?("Excess information in symmetric properties")
+assert warning?("Illegal information in number of arguments properties")
 assert warning?("Undefined $-variable")
 *--#] Issue766 : 
 *--#[ PullReq535 :

sources/names.c

@@ -1548,7 +1548,6 @@ retry:;
 				|| ( StrICont(par,(UBYTE *)"args") == 0 ) ) {}
 				else {
 					Warning("Illegal information in number of arguments properties currently ignored");
-					error = 1;
 				}
 				*s = cc;
 			}
@@ -1572,7 +1571,6 @@ retry:;
 				|| ( StrICont(par,(UBYTE *)"args") == 0 ) ) {}
 				else {
 					Warning("Illegal information in number of arguments properties currently ignored");
-					error = 1;
 				}
 				*s = cc;
 			}