tests: Resolve possible overrun

Coverity noted that each of the fmemopen called used the strlen value
in order to allocate space, but that neglected space for terminating
null string. So just add 1 to the strlen.
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>
Reviewed-by: NErik Skultety <eskultet@redhat.com>

tests/vircgroupmock.c

@@ -466,12 +466,13 @@ FILE *fopen(const char *path, const char *mode)
         if (STREQ(mode, "r")) {
             if (allinone)
                 return fmemopen((void *)procmountsallinone,
-                                strlen(procmountsallinone), mode);
+                                strlen(procmountsallinone) + 1, mode);
             else if (logind)
                 return fmemopen((void *)procmountslogind,
-                                strlen(procmountslogind), mode);
+                                strlen(procmountslogind) + 1, mode);
             else
-                return fmemopen((void *)procmounts, strlen(procmounts), mode);
+                return fmemopen((void *)procmounts,
+                                strlen(procmounts) + 1, mode);
         } else {
             errno = EACCES;
             return NULL;
@@ -481,12 +482,13 @@ FILE *fopen(const char *path, const char *mode)
         if (STREQ(mode, "r")) {
             if (allinone)
                 return fmemopen((void *)proccgroupsallinone,
-                                strlen(proccgroupsallinone), mode);
+                                strlen(proccgroupsallinone) + 1, mode);
             else if (logind)
                 return fmemopen((void *)proccgroupslogind,
-                                strlen(proccgroupslogind), mode);
+                                strlen(proccgroupslogind) + 1, mode);
             else
-                return fmemopen((void *)proccgroups, strlen(proccgroups), mode);
+                return fmemopen((void *)proccgroups,
+                                strlen(proccgroups) + 1, mode);
         } else {
             errno = EACCES;
             return NULL;
@@ -496,12 +498,13 @@ FILE *fopen(const char *path, const char *mode)
         if (STREQ(mode, "r")) {
             if (allinone)
                 return fmemopen((void *)procselfcgroupsallinone,
-                                strlen(procselfcgroupsallinone), mode);
+                                strlen(procselfcgroupsallinone) + 1, mode);
             else if (logind)
                 return fmemopen((void *)procselfcgroupslogind,
-                                strlen(procselfcgroupslogind), mode);
+                                strlen(procselfcgroupslogind) + 1, mode);
             else
-                return fmemopen((void *)procselfcgroups, strlen(procselfcgroups), mode);
+                return fmemopen((void *)procselfcgroups,
+                                strlen(procselfcgroups) + 1, mode);
         } else {
             errno = EACCES;
             return NULL;