staging: r8188eu: simplify control flow

The function iterates an index from 0 to NUM_PMKID_CACHE and returns
the first index for which the condition is true. If no such index is
found, the function returns -1. Current code has a complex control
flow that obfuscates this simple task. Replace it with a loop.

Also, given the shortened function body, replace the long variable
name psecuritypriv with a short variable name p.

Reported by checkpatch:

WARNING: else is not generally useful after a break or return
Signed-off-by: Sevinj Aghayeva <sevinj.aghayeva@gmail.com>
Link: https://lore.kernel.org/r/20220403164250.GA371601@euclidSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/core/rtw_mlme.c

@@ -1637,26 +1637,13 @@ int rtw_restruct_wmm_ie(struct adapter *adapter, u8 *in_ie, u8 *out_ie, uint in_
 
 static int SecIsInPMKIDList(struct adapter *Adapter, u8 *bssid)
 {
-	struct security_priv *psecuritypriv = &Adapter->securitypriv;
-	int i = 0;
-
-	do {
-		if ((psecuritypriv->PMKIDList[i].bUsed) &&
-		    (!memcmp(psecuritypriv->PMKIDList[i].Bssid, bssid, ETH_ALEN))) {
-			break;
-		} else {
-			i++;
-			/* continue; */
-		}
-
-	} while (i < NUM_PMKID_CACHE);
+	struct security_priv *p = &Adapter->securitypriv;
+	int i;
 
-	if (i == NUM_PMKID_CACHE) {
-		i = -1;/*  Could not find. */
-	} else {
-		/*  There is one Pre-Authentication Key for the specific BSSID. */
-	}
-	return i;
+	for (i = 0; i < NUM_PMKID_CACHE; i++)
+		if (p->PMKIDList[i].bUsed && !memcmp(p->PMKIDList[i].Bssid, bssid, ETH_ALEN))
+			return i;
+	return -1;
 }
 
 /*  */